David May

Liquid Pavement Marking Compositions

Application

#6451874 Sep 17, 2002

Filed

Oct 27, 2000

Inventor

Mark D. Purgett (Oakdale, MN) · David C. May (Hudson, WI) · Mark D. Zender (White Bear Lake, MN) · Daniel J. Willie (Minneapolis, MN) · Thomas R. Borden (Oakdale, MN)

Appl. No.

09/698735

Assignee

3M Innovative Properties Company (St. Paul, MN)

International Classification

F21V 722

U.S. Classification

523172

Abstract

A pavement marking composition, methods of applying, and pavement markings produced therefrom. The composition is a two-part coating composition having an amine component including one or more aspartic ester amines and optionally one or more amine-functional coreactants, an isocyanate component including one or more polyisocyanates, and material selected from the group of fillers, extenders, pigments, and combinations thereof.

Claim

What is claimed is: 1. A pavement marking comprising: a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: one or more aliphatic secondary amines; one or more polyisocyanates; material selected from the group consisting of fillers, extenders, pigments, and combinations thereof; and reflective elements; wherein the coating composition has a minimum application temperature of at least about 7° C. 2. A pavement marking comprising: a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: one or more aliphatic secondary amines; one or more polyisocyanates; material selected from the group consisting of fillers, extenders, pigments, and combinations thereof; and reflective elements; wherein the coating composition has a track-free time of no greater than about 5 minutes. 3. A pavement marking comprising: a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: one or more aliphatic secondary amines; one or more polyisocyanates; material selected from the group consisting of fillers, extenders, pigments, and combinations thereof; and reflective elements; wherein the pavement marking has an open time of at least 30 seconds and a retained reflectivity of at least 100 mcd/m2/lux after at least 2 years in use as longitudinal traffic markings as measured according to ASTM E 1710-95. 4. A pavement marking comprising: a binder having polyurea groups, wherein the binder is prepared from a coating composition comprising: one or more aliphatic secondary amines; one or more polyisocyanates; material selected from the group consisting of fillers, extenders, pigments, and combinations thereof; and reflective elements; wherein the coating has an open time of at least 30 seconds and a minimum application temperature of at least about 7° C. 5.

Centrifugal Filter Utilizing A Partial Vacuum Condition To Effect Reduced Air Drag On The Centrifuge Rotor

Application

#6579218 Jun 17, 2003

Filed

Sep 6, 2000

Inventor

David F. May (Columbus, IN) · Louis A. Krempel (Columbus, IN) · Steven J. Merritt (Kearney, NE)

Appl. No.

09/655583

Assignee

Analytical Engineering, Inc. (Columbus, IN)

International Classification

B01D 2126

U.S. Classification

494 24, 494 49, 494 62, 494 84, 184 624

Abstract

A centrifuge filter for removing soot from engine oil. The centrifuge filter includes a rotor adapted to be rotated inside a centrifuge housing by an electric motor or other means. The rotor preferably includes a reusable aluminum support casing and a disposable plastic cartridge. The plastic cartridge includes a trap with partition walls to prevent wave formation in the rotating liquid contained in the trap. The cartridge includes an annular inlet through its top end, a winding flow path through the cartridge and an outlet at the bottom enc. The centrifuge housing includes an isolated sealed rotor chamber. Using the venturi effect, air is evacuated from the rotor chamber to provide a partial vacuum to reduce air drag on the rotor. Resilient rubber vibration isolators are used to reduce vibrations and engine induced shock loads from reaching the rotating element. A side oil inlet is provided in the cartridge to receive unfiltered oil at a location offset from the axis of rotation.

Claim

What is claimed is: 1. In an engine of a vehicle, a centrifuge housing supporting a centrifuge rotor for rotation about a predetermined axis for removal of soot from engine oil, the centrifuge housing comprising: a drive mechanism external to the centrifuge rotor mechanically coupled to the centrifuge rotor for driving the centrifuge rotor about the predetermined axis; a sealed centrifuge rotor chamber providing an isolated environment in which the centrifuge rotor is supported for rotation; an inlet port connected to the engine to receive oil; an outlet port connected to the engine to return oil to the engine; a venturi conduit interposed between the inlet port and the outlet port, having operatively larger and smaller flow capacity passage portions adapted to create a low pressure region, the isolated atmosphere fluidically connected to the venturi conduit wherein the low pressure region creates a partial vacuum in the isolated environment of the sealed centrifuge rotor chamber for reduced air drag on the centrifuge rotor during rotation; a housing body having an open end and a removable lid, a seal disposed between the removable lid and the housing body to maintain the isolated environment, the housing body including a mount adapted to be mounted to a vehicle, the centrifuge rotor being serviced through the open end via removal of the lid; an inlet conduit deriving a portion of the oil flow from the inlet port for filtering, the inlet conduit including an unfiltered oil outlet feeding unfiltered oil into the centrifuge rotor; and a restriction interposed along the inlet conduit controlling the flow rate of unfiltered oil through the unfiltered oil outlet, the restriction being provided by a plug selected from a plurality of plugs, each plug providing a restriction having a different effect on the pressure and flow rate of oil into the centrifuge rotor, the size of the restriction being selected to provide a residence time for oil in the centrifuge rotor that is sufficiently long enough to facilitate removal of soot from oil. 2. The centrifuge housing of claim 1 further comprising a housing body having an open end and a removable lid, a seal disposed between the removable lid and the housing body to maintain the isolated environment, the housing body including a mount adapted to be mounted to a vehicle, the centrifuge rotor being serviced through the open end via removal of the lid. 3. The centrifuge housing of claim 2 wherein the inlet port, the outlet port and venturi conduit are integrally provided by the housing body. 4.

Storage And Dispensing Apparatus

Application

#7134583 Nov 14, 2006

Filed

Apr 26, 2004

Inventor

David L. May (Ashburn, VA) · Kirstin S. May (Ashburn, VA)

Appl. No.

10/831951

Assignee

David L. May (Ashburn, VA) · Kirstin S. May (Ashburn, VA)

International Classification

B26F 3/00

U.S. Classification

225 97, 225 34, 225 46

Abstract

The present invention is directed to an improved gift wrap storage and dispensing device, comprising a container and a lid, which are rotatable with respect to one another. Wrapping paper is stored on dowels within the container and is dispensed through openings in the side wall of the container. The wrapping paper is cut using a cutting device positioned on the outside wall of the container. Similarly, the lid contains a dispensing housing for storing rolls of tape, ribbon, etc. , which can be dispensed through openings in the side wall of the lid and cut using a cutting device.

Method And Apparatus For Semi-Continuous Casting Of Hollow Ingots And Products Resulting Therefrom

Application

#8074704 Dec 13, 2011

Filed

Mar 24, 2010

Inventor

Alan Blackburn (Reading, PA) · Richard Roth (Birdsboro, PA) · Andrew Purse (Downingtown, PA) · David May (Robesonia, PA)

Appl. No.

12/730970

Assignee

Titanium Metals Corporation (Dallas, TX)

International Classification

B22D 11/00, B22D 27/04, B22D 23/06

U.S. Classification

164464, 164465, 164421, 164494, 1642501, 164512, 164485, 164443

Abstract

Methods and associated apparatus for semi-continuous casting of hollow ingots are described. In one embodiment a method for the semi-continuous casting of a metallic hollow ingot is provided. The method includes providing a mold that includes a mold center having an inner pipe and an outer pipe arranged to form an annular space for a cooling media and an outer mold, circulating a cooling media in the annular space, feeding a source material to the mold, heating the source material to produce a molten material, moving the mold center progressively downward relative to the outer mold, and solidifying the molten material to form a hollow ingot. Embodiments relating to an apparatus for semi-continuous casting of hollow ingots, and products resulting from the semi-continuous casting of hollow ingots are also described.

Power Isolation During Sensitive Operations

Application

#8525545 Sep 3, 2013

Filed

Aug 27, 2012

Inventor

David May (The Villages, FL) · Burton Wolfe (Ocoee, FL)

Appl. No.

13/595512

Assignee

Lockheed Martin Corporation (Bethesda, MD)

International Classification

H03K 19/00

U.S. Classification

326 8, 326 9, 326 38

Abstract

Power isolation during sensitive operations is disclosed. In one embodiment, a programmable chip package includes a programmable chip configured to perform a sensitive operation, and a switch configured to selectively couple a main power source to the programmable chip. The programmable chip package may also include an alternate power source and a controller that is configured to control the switch to decouple the main power source from the programmable chip prior to the sensitive operation, wherein the programmable chip is configured to draw power from the alternate power source during the sensitive operation. The controller is further configured to control the switch to couple the main power source to the programmable chip after the sensitive operation.

Retroreflective Sheeting Having An Abrasion Resistant Ceramer Coating

Application

#5677050 Oct 14, 1997

Filed

May 19, 1995

Inventor

Zayn Bilkadi (Mahtomedi, MN) · David C. May (Hudson, WI)

Appl. No.

8/444076

Assignee

Minnesota Mining and Manufacturing Company (St. Paul, MN)

International Classification

B32B 516

U.S. Classification

428331

Abstract

Retroreflective sheeting having an abrasion-resistant ceramer coating that is prepared from about 20% to about 80% ethylenically unsaturated monomers; about 10% to about 50% of acrylate functionalized colloidal silica; and about 5% to about 40% N,N-disubstituted acrylamide or N-substituted-N-vinyl-amide monomer having a molecular weight between 99 and 500 atomic mass units; wherein said percentages are weight percents of the total weight of said coating. A method of coating retroreflective sheeting with an abrasion-resistant cured ceramer layer is also disclosed.