David M Guthrie

US Patent:

6611205, Aug 26, 2003

Filed:

Jun 5, 2002

Appl. No.:

10/161724

Inventors:

David C. Guthrie - Chester Springs PA
Charles P. Coggins - Downingtown PA

Assignee:

Allstar Corporation - Downingtown PA

International Classification:

G08B 108

US Classification:

340539, 3405451, 340564, 34082569, 49 26

Abstract:

An emergency control system for opening or closing a gate resides within a controller for regulating operation of the opening/closing mechanism of the gate. A safety station is in communication with the controller and includes means to signal the emergency control circuit to open or close the gate by using either of two pushbutton switches. Sensing means which detect an unsafe condition in the area of the gate such as human entrapment is connected to the controller and initiates an alarm mode operation of the controller when an unsafe condition is detected and turns on a sound alarm. Pushing either of the safety button switches turns off the sound alarm and moves the gate. Movement of the gate is stopped if the pressed button is released while the gate is in motion which otherwise continues to its limit. The emergency control circuit is responsive to input signals from the safety station only when the controller is in the alarm mode.

US Patent:

D3223868, Dec 17, 1991

Filed:

Oct 11, 1989

Appl. No.:

7/419632

Inventors:

John F. Ginther - North Wales PA
Kim E. Burrichter - Upper Darby PA
Charles P. Coggins - Downingtown PA
David C. Guthrie - Chester Springs PA
Mark K. Lucchi - West Chester PA

Assignee:

Allister Manufacturing Company, Inc. - West Chester PA

US Classification:

D 8330

US Patent:

D3245110, Mar 10, 1992

Filed:

Oct 11, 1989

Appl. No.:

7/420126

Inventors:

John F. Ginther - North Wales PA
Kim E. Burrichter - Upper Darby PA
Charles P. Coggins - Downingtown PA
David C. Guthrie - Chester Springs PA
Mark K. Lucchi - West Chester PA

Assignee:

Allister Manufacturing Company, Inc. - West Chester PA

US Classification:

D13170

US Patent:

20150121540, Apr 30, 2015

Filed:

Oct 28, 2013

Appl. No.:

14/064426

Inventors:

- Carlsbad CA, US
David Charles Guthrie - Chester Springs PA, US
Ik Huh - Seoul, KR
John Raymond Lafond - Norfolk MA, US
Kevin Dean Ward - Bitely MI, US

Assignee:

Linear LLC - Carlsbad CA

International Classification:

G06F 21/10
G06Q 50/18
G06F 9/445

US Classification:

726 27

Abstract:

A system for distributing a license key for upgrading an access control system. A portable token that includes first and second identifiers, such as a visible serial number and a concealed control number that can be derived from the serial number. The access control system is identified by a third identifier, such as a MAC address. A license server generates a license key from the first, second and third identifiers that is operative to allow access to software features that are resident on the access control system without the need for an Internet connection.