Bruce A Erickson

US Patent:

40445976, Aug 30, 1977

Filed:

Sep 13, 1976

Appl. No.:

5/723035

Inventors:

Bruce G. Erickson - Santa Clara CA

Assignee:

American Microsystems, Inc. - Santa Clara CA

International Classification:

G04D 712

US Classification:

73 6

Abstract:

A visual tuning-aid system for aligning an electronic timepiece to a correct reference frequency is disclosed. A reference oscillator in the system provides a reference signal at a precisely fixed predetermined frequency which is, or is converted to, the correct alignment frequency for the timepiece. A sensor electrostatically detects a time base signal in the timepiece and a bandpass amplifier removes any extraneous signals. The reference signal and the time base signal are provided to a phase shift indicating device of a multiphase motor in the system which provides a visual display, the movement of which is proportional to the rate of phase change between the reference signal and the time base signal. Alignment of the timepiece to the correct frequency stops the phase change and thereupon the visual display stops moving.

US Patent:

40247503, May 24, 1977

Filed:

May 19, 1975

Appl. No.:

5/578606

Inventors:

Bruce G. Erickson - Santa Clara CA

Assignee:

American Micro-systems, Inc. - Santa Clara CA

International Classification:

G04D 712
G01R 2312

US Classification:

73 6

Abstract:

A visual tuning-aid system for aligning an electronic timepiece to a correct reference frequency is disclosed. A reference oscillator in the system provides a reference signal at a precisely fixed predetermined frequency which is, or is converted to, the correct alignment frequency for the timepiece. A sensor electrostatically detects a time base signal in the timepiece and a bandpass amplifier removes any extraneous signals. The reference signal and the time base signal are provided to a phase shift indicating device in the system which provides a visual display, the movement of which is proportional to the rate of phase change between the reference signal and the time base signal. Alignment of the timepiece to the correct frequency stops the phase change and thereupon the visual display stops moving.

US Patent:

48618667, Aug 29, 1989

Filed:

Jan 21, 1987

Appl. No.:

7/005915

Inventors:

Emmett L. Durrum - Menlo Park CA
Stephen Amendola - San Carlos CA
Bruce W. Erickson - Chapel Hill NC

Assignee:

Eldex Laboratories, Inc. - Menlo Park CA

International Classification:

C12M 100
C12M 136
A61K 3702
C07C10352

US Classification:

530333

Abstract:

A continuous flow peptide synthesizer (10) has reservoirs (12-42) for amino acid derivatives and reservoirs (154-156 and 161-167) for peptide synthesis reagents and solvents. A column (44) has column segments (224, 226, 228) forming stacked interconnected chambers for holding peptide synthesis polymeric resin supports (260). Each of the amino acid derivative reservoirs (12-42) and the reagent and solvent reservoirs (152-154 and 161-167) are connected through a separate controllable valve (46-76, 154-156 or 182-194) to the column (44). A pressurized source (106) of helium or other inert gas is provided for transferring the amino acid derivatives, reagents and solvents to the column (44). The column segments (224) are also used in a vessel (270) for confining the polymeric resin supports (260) in the vessel during cleavage of the peptides from the supports (260).

US Patent:

39756785, Aug 17, 1976

Filed:

May 19, 1975

Appl. No.:

5/578608

Inventors:

Bruce G. Erickson - Santa Clara CA

Assignee:

American Micro-Systems, Inc. - Santa Clara CA

International Classification:

G01R 2922
G01R 2302

US Classification:

324 56

Abstract:

Apparatus for ascertaining that the resonant frequency of a crystal frequency determining element lies within a predetermined frequency range is disclosed. A crystal whose frequency is to be measured is connected to an oscillator which provides vertical and horizontal deflection signals to a cathode ray tube device. Two crystal controlled signal generators provide series of short duration output impulses which are applied to the control grid of the cathode ray tube. One oscillator operates at the upper frequency limit of the frequency range, and the other oscillator operates at the lower frequency limit. If the crystal undergoing tests lies between the two frequencies of the two reference generators, two spots appearing on the screen of the cathode ray tube will rotate countercurrent with one another. If the frequency of the crystal undergoing test lies outside of the frequency range fixed by the two signal generators, those spots will rotate in the same direction, either clockwise or counterclockwise, depending upon whether the frequency of the crystal lies above or below the desired range.