William Andrew Williamson

US Patent:

52587436, Nov 2, 1993

Filed:

Jan 4, 1993

Appl. No.:

8/000789

Inventors:

Jon Nelson - St. Paul MN
William W. Williamson - Somerset WI

Assignee:

Uniplex Corporation - St. Paul MN

International Classification:

G08B 1314

US Classification:

340568

Abstract:

A piezoelectric resilient arm contacts a projected object and establishes a reference relative to sensitivity means and differential detector means including feedback coupled amplifier means which operates in cooperation with a balanced square wave generator means for producing a switched output upon detecting motion. An alarm signal is produced which has a duration related to the rate of change of movement of the piezoelectric resilient arm. Programmable delay means appropriately enables an annunciator and/or wireless communication link to a system controller.

US Patent:

60815469, Jun 27, 2000

Filed:

Dec 31, 1997

Appl. No.:

9/001860

Inventors:

William Williamson - Hudson WI
Wen Ping Wang - Minneapolis MN

Assignee:

Birch Bridge Communications Corp. - St. Paul MN

International Classification:

H04M 124
H04M 308
H04M 322
H04M 1104

US Classification:

375 33

Abstract:

A telephone system including circuitry for monitoring the "on hook" and "off hook" conditions of telephone handsets coupled to a system controller and disconnecting all off hook handsets from the telephone line. With the detection of an alarm condition at a security alarm system that requires a communication link, line seizure is effected via an SCR controlled seizure circuit serially connected between each distributed handset and the telephone line. The seizure circuit normally conducts when a connected telephone is off hook. Upon detecting an alarm, a line monitor momentarily shorts the telephone line to drive any conducting line seizure circuits into a non-conducting condition that is maintained sufficiently long to permit the system controller to gain control of the line. During controller communications, the handsets are also isolated from the telephone line. A local phone is also coupled to permit reprogramming if an inoperative line is detected.

US Patent:

47377704, Apr 12, 1988

Filed:

Mar 10, 1986

Appl. No.:

6/837208

Inventors:

Robert E. Brunius - St. Paul MN
Jon R. Nelson - St. Paul MN
William W. Williamson - Somerset WI

Assignee:

Interactive Technologies, Inc. - North St. Paul MN

International Classification:

G08B 108
G08B 2600

US Classification:

340539

Abstract:

A family of serially programmable integrated circuit transmitters for use in various sensor and user data input transmitters of a short-range radio frequency linked security system. Each transmitter transmits two bits of data for each data frame of a pulse position encoded message format with multiples of each message being transmitted with each transmission, the number of messages depending upon the type of message. Each user data input transmitter includes means for decoding keyboard entered data, re-circulating means for storing the user entered data and programmed system parameters and means for time partitioning intra and inter-message transmissions. Each sensor transmitter includes means for storing uniquely programmed system preconditioning parameters, means for sensing and verifying alarm conditions and means for time partitioning intra and inter-message transmissions. A hand-held programming unit permits the programming of each user data input and sensor transmitter with a variety of system pre-conditioning parameters to identify the transmitter to a system controller and the type of transducer coupled to the sensor transmitter.

US Patent:

D2994224, Jan 17, 1989

Filed:

Jun 13, 1986

Appl. No.:

6/874363

Inventors:

William W. Williamson - Somerset WI
Robert E. Brunius - St. Paul MN

Assignee:

Interactive Technologies, Inc. - North St. Paul MN

US Classification:

D 8353