John A Macpherson

US Patent:

42253454, Sep 30, 1980

Filed:

Aug 8, 1978

Appl. No.:

5/931966

Inventors:

James M. Adee - San Diego CA
John A. MacPherson - Chula Vista CA

International Classification:

B22F 300

US Classification:

75211

Abstract:

The disclosed process forms metal parts from a mixture containing a powdered metal, a plasticizer, and at least two binders. Some of these binder materials are selectively extractable from the mixture without sintering. After the mixture is shaped into the form of the desired part and prior to sintering, the plasticizer and the extractable binders are removed. This produces a part having both sufficient green strength and a relatively low binder content. On sintering, remaining binders decompose; and the resulting part has a carbon content of less than 1. 0%.

US Patent:

49491946, Aug 14, 1990

Filed:

Feb 26, 1988

Appl. No.:

7/160883

Inventors:

John A. MacPherson - San Diego CA
Ernest V. Johnson - Phillipston MA

Assignee:

Quest Technology Corporation - San Diego CA

International Classification:

G11B 548

US Classification:

360104

Abstract:

A support arm is adapted for high-speed positioning of a transducer such as a read/write head in a magnetic disk drive. The support arm is essentially composed of a ceramic material having a high specific stiffness. The support arm is shaped to form structures integral of the support arm for mating with fasteners for connecting a transducer assembly to one end of the support arm and for connecting the support arm to a positioning actuator.

US Patent:

59321652, Aug 3, 1999

Filed:

Apr 18, 1997

Appl. No.:

8/844233

Inventors:

W. James Corbett - Cumming GA
Christopher H. Schiller - Cumming GA
John A. MacPherson - Chula Vista CA

Assignee:

NetShape Components, Inc. - Alpharetta GA

International Classification:

B28B 124

US Classification:

2643282

Abstract:

A ceramic spinneret used for producing manufactured fibers and formed from a fine grained, essentially pure structural ceramic such as aluminum oxide, zirconium oxide, composites of aluminum oxide and zirconium oxide known as toughed ceramics, silicon nitride, silicon carbide, or any fine grained essentially pure structural ceramic. Such spinnerets are formed as a single piece and contain non-circular capillaries suitable for forming shaped or void containing fibers.