David A Armstrong

US Patent:

60657510, May 23, 2000

Filed:

Apr 30, 1998

Appl. No.:

9/070182

Inventors:

David Garvin Armstrong - Brunswick ME

International Classification:

A63F 300

US Classification:

273271

Abstract:

A retainer for the game of Go so configured that when the retainer is secured over a board on which a game is in progress, each stone on the board is constrained to remain in its proper position. Retention means are provided for holding the retainer and the playing board together reliably so that they can be moved about, placed on edge for storage, etc. , as may be convenient. Integral means are provided for indicating which side has the next turn, the color and the net number of the captured stones, and the intersection, if any, on which immediate play is forbidden because of an active "ko".

US Patent:

42643902, Apr 28, 1981

Filed:

Sep 17, 1979

Appl. No.:

6/076212

Inventors:

David E. Armstrong - Royal Oak MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

B31F 129

US Classification:

156205

Abstract:

An apparatus and method for providing permanent pipe sections in a foam-backed material that utilizes two rotating members which cooperate to form alternate ridges and valleys in the material after which the valley portions are bonded to a backing sheet so as to maintain the pipe sections in the material.

US Patent:

52627870, Nov 16, 1993

Filed:

Feb 10, 1993

Appl. No.:

8/019323

Inventors:

William J. Wilson - Wenham MA
David G. Armstrong - Brunswick ME
Roy E. Byington - Sudbury MA
Nathan Freedman - West Newton MA
Neil F. Lacey - Framingham MA
Fritz A. Gross - Weston MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01S 7I0

US Classification:

342173

Abstract:

A radar performance monitor (RPM) receives a transmitted radar signal from a radar system being monitored and couples the signal to a recirculating loop comprising a SAW delay line in order to produce a series of simulated radar return signals of equal amplitude and by using the same frequency as the received radar signal providing the frequency falls within a predetermined bandwidth of the SAW delay line. The simulated radar return signals are displayed at the radar system and used to evaluate the operation and calibration of a transmitter and the sensitivity and calibration of a transmitter and the sensitivity and calibration of a receiver in the radar system. The radar performance monitor is actuated at the option of a radar operator.