Donald A Duncan

US Patent:

41525400, May 1, 1979

Filed:

May 3, 1977

Appl. No.:

5/793393

Inventors:

Donald A. Duncan - Cambridge MA
Lawrence E. Brown - New Kensington PA

Assignee:

American Pacemaker Corporation - Woburn MA

International Classification:

H01B 1726
A61N 136

US Classification:

174152GM

Abstract:

A feedthrough connector for use on an implantable electronic cardiac pacer. A single structure provides a means for connecting a heart lead to the pacer and feedthrough into the body of the pacer. The feedthrough may include filtering means to protect against external interferences. The entire structure has provisions for physical compliance to absorb stresses due to different heat coefficients and as may be caused during assembly and use. Also disclosed is a method for making the feedthrough connector.

US Patent:

48524433, Aug 1, 1989

Filed:

Mar 24, 1986

Appl. No.:

6/843054

Inventors:

Donald A. Duncan - Cambridge MA
Jeffrey B. Tripp - Rockport MA

Assignee:

Key Concepts, Inc. - Woburn MA

International Classification:

G10H 314

US Classification:

84 104

Abstract:

A novel capacitive pressure-sensitive sensing technique and apparatus wherein an elastomeric conductive electrode carrying a two-dimensional array of projections is pressure-deformed against a fixed coextensive cooperative electrode to generate signals, such as tones and sounds in the application to musical instruments, or visual representations, corresponding to the dynamic pressures applied over the two-dimensional surface. A novel drum-like and other musical instruments embodying such novel capacitive sensing techniques and the like are described.

US Patent:

49338072, Jun 12, 1990

Filed:

Aug 23, 1989

Appl. No.:

7/397766

Inventors:

Donald A. Duncan - Cambridge MA

Assignee:

Key Concepts, Inc. - Woburn MA

International Classification:

G10H 102
H01G 700

US Classification:

361283

Abstract:

A capacitive pressure-sensitive and displacement-sensitive sensor apparatus and method in which first electrode means comprising a thin resilient conductive inclined or arcuate plastic sheet having a plurality of resilient projections protruding from the inner surface of the sheet and with said projections pressure-deformable by application of pressure thereat from the outer surface of the sheet cooperates with a second relatively flat electrode facing and coextensive with the projections and separated from the same by a thin dielectric layer therebetween, the first electrode extending inclinedly or arcuately over the second electrode such that when force is applied to the resilient first electrode along said outer surface thereof, as by a portion of means such as a keyboard key contacting the same, it approaches the second electrode and dielectric layer through air in a fashion which causes the resilient deformable projections along the inclined or arcuate inner surface thereof to contact said dielectric layer sequentially in a predictable order.