Harry Cheryl Mitchell

US Patent:

7226665, Jun 5, 2007

Filed:

Jun 20, 2003

Appl. No.:

10/601269

Inventors:

Hamid G Kia - Bloomfield Hills MI, US
Terrence J Wathen - Sterling Heights MI, US
Mark A Buffa - Utica MI, US
Harry A Mitchell - Sterling Heights MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B32B 27/00

US Classification:

428515, 428212, 4284237, 428482, 428500

Abstract:

A multilayer composite contains a gel coat layer, a laminate layer, and a barrier layer disposed between the gel coat and the laminate layer. The laminate contains from 40–80% by weight paste and from 20–60% by weight reinforcing fibers. The barrier coat also comprises a cured polyester resin, and contains reinforcing fibers shorter than those in the laminate layer. The barrier layer has sufficient flexibility to avoid cracking during demolding and handling. Preferably, the barrier layer exhibits an elongation at break of more than 1%, and more preferably about 2% or more. The resin of the barrier layer can contain up to about 25% by weight of the resin of an isophthalic acid based polyester resin. The composites can be made using an open tool molding process.

US Patent:

7341785, Mar 11, 2008

Filed:

Jun 20, 2003

Appl. No.:

10/601250

Inventors:

Hamid G Kia - Bloomfield Hills MI, US
Harry A Mitchell - Sterling Heights MI, US
Terrence J Wathen - Sterling Heights MI, US
Mark A Buffa - Utica MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B32B 27/40
B32B 27/06

US Classification:

4284237, 428482, 524494

Abstract:

Composite articles are prepared by a spray up operation. In a first step, a gel coat is applied onto a mold surface which has been optionally pretreated with a mold release coating. Next, a barrier coat is applied over the gel coat in the mold and thereafter a laminate formula is applied over the barrier coat. The laminate contains from 40-80% by weight paste and from 20-60% by weight reinforcing fibers. In a preferred embodiment, the paste comprises 90% or more by weight resin, up to 5% filler, and an initiator composition capable of initiating cure at a temperature of 50 C. or lower. In a preferred embodiment, the multilayer composite has a thickness of about 15 mm or less, and is useful as an automobile body panel. The laminate preferably comprises a low shrink, low density glass fiber filled polyester resin. In a preferred embodiment, the paste of the laminate contains a dicyclopentadiene unsaturated polyester resin, polymeric hollow microspheres, and an initiator capable of initiating curing at room temperature or at temperature of 50 C. or less.

US Patent:

20080090060, Apr 17, 2008

Filed:

Dec 11, 2007

Appl. No.:

11/953895

Inventors:

Hamid Kia - Bloomfield Hills MI, US
Harry Mitchell - Sterling Heights MI, US
Terrence Wathen - Sterling Heights MI, US
Mark Buffa - Utica MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - DETROIT MI

International Classification:

B32B 7/02
B05D 1/36

US Classification:

428215000, 427407100, 428219000, 428332000

Abstract:

Composite articles are prepared by a spray up operation. In a first step, a gel coat is applied onto a mold surface which has been optionally pretreated with a mold release coating. Next, a barrier coat is applied over the gel coat in the mold and thereafter a laminate formula is applied over the barrier coat. The laminate contains from 40-80% by weight paste and from 20-60% by weight reinforcing fibers. In a preferred embodiment, the paste comprises 90% or more by weight resin, up to 10% filler, and an initiator composition capable of initiating cure at a temperature of 50 C. or lower. In a preferred embodiment, the multilayer composite has a thickness of about 15 mm or less, and is useful as an automobile body panel. The laminate preferably comprises a low shrink, low density glass fiber filled polyester resin. In a preferred embodiment, the paste of the laminate contains a dicyclopentadiene unsaturated polyester resin, polymeric hollow microspheres, and an initiator capable of initiating curing at room temperature or at temperature of 50 C. or less.

US Patent:

44748450, Oct 2, 1984

Filed:

Aug 26, 1982

Appl. No.:

6/412034

Inventors:

Edward M. Hagerman - Royal Oak MI
Harry A. Mitchell - Sterling Heights MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B32B 516

US Classification:

428283

Abstract:

A method is provided for compacting viscous polymeric molding compositions preparatory to compression molding to substantially improve the physical properties of articles molded therefrom. Suitable compositions include those filled with a geometric reinforcing particulate filler that are flowable and thermosettable when compression molded. The method comprises forming a slab of a said filler composition and thereafter reducing its thickness by passing it between spaced-apart pairs of compression means. The pair members of the means are spaced apart to ultimately substantially reduce its thickness. The method yields unexpected improvements in the tensile strength, isotropy and surface characteristics of articles compression molded from the compounds.

US Patent:

39773710, Aug 31, 1976

Filed:

Jun 19, 1975

Appl. No.:

5/588332

Inventors:

Harry Ream Mitchell - Bloomfield Hills MI
Neil Arthur Schilke - Rochester MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

F02D 3900

US Classification:

123 97R

Abstract:

A throttle motion indicator device for an internal combustion engine of a vehicle having an induction system including a movable throttle for controlling flow through an induction passage and, an operator actuated accelerator pedal linkage, including a throttle rod, operatively connected to the throttle for controlling movement thereof, the indicator device including a spring positioned roller carried by the throttle rod in position to engage a detent means suitably positioned in the path of the roller as carried by the throttle rod to indicate to the operator a throttle position for improved fuel economy. With this device, the driver depresses the accelerator pedal until he feels a slight stiffening in the throttle movements which alerts him that he has reached a predetermined limit in acceleration rate to obtain good fuel economy. In an alternate embodiment, the detent means carries two detents to provide a signal to the operator of a range of throttle positions within an optimum acceleration range.

US Patent:

43377386, Jul 6, 1982

Filed:

Jun 19, 1975

Appl. No.:

5/588333

Inventors:

William C. Bubniak - Troy MI
Harry R. Mitchell - Bloomfield Hills MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

F02D 1306

US Classification:

123198F

Abstract:

A valve control mechanism for effecting split engine operation of an internal combustion engine of the overhead valve type in which each valve is actuated by a rocker arm normally fulcrummed intermediate its ends on an apertured pivot bearing slidably supported on a mounting stud fixed to the cylinder head of the engine, with one end of the rocker arm engaging the stem of the valve to be actuated and its other end being engaged by a reciprocating push rod, the valve control mechanism including a slider support fixed to the mounting stud above the rocker arm, a spring engaged between the slider support and the pivot bearing to normally bias the pivot bearing toward an operative position whereat the rocker arm is pivotable about the pivot bearing, a stepped slider slidably supported by the slider support for movement between a first position at which the pivot bearing is in its operative position relative to the rocker arm and a second position permitting movement of the rocker arm to a position at which the rocker arm is then fulcrummed on the end of the valve stem and, power means operatively connected to the slider to selectively move the slider between the first position and the second position.

US Patent:

42456118, Jan 20, 1981

Filed:

Sep 5, 1978

Appl. No.:

5/939457

Inventors:

Harry R. Mitchell - Bloomfield Hills MI
Hal H. Rice - Birmingham MI

Assignee:

General Motors Corporation - Detroil MI

International Classification:

F02B 7508

US Classification:

123669

Abstract:

Internal combustion engine pistons are provided with aluminum bodies with highly insulative ceramic inserts cast in place in the upper combustion chamber defining wall. In each of the disclosed embodiments, the ceramic insert has tapered edges to dovetail the insert in place. A fibrous ceramic cushioning layer applied around the insert edge before casting distributes cooling stresses and allows limited relative expansion and contraction of the aluminum body and ceramic insert without overstressing either of the members. Other features are also included.

US Patent:

39746500, Aug 17, 1976

Filed:

Sep 15, 1975

Appl. No.:

5/613474

Inventors:

Harry R. Mitchell - Bloomfield Hills MI
Hal H. Rice - Birmingham MI
James R. Abel - Birmingham MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

F01N 310

US Classification:

60282

Abstract:

An exhaust reactor manifold having a reaction chamber formed by a hardened insulative ceramic liner which is supported within a protective housing. The liner walls are protected and insulated by compessible fibrous insulation. Springs and wedges in the housing act through the insulation blanket to load the liner walls in compression. Inlet and exhaust ports are provided through angled sealing surfaces of the liner which are urged by the compressive loading of the liner into engagement with mating surfaces of a ported mounting portion of the housing.