John J Mcgrath

US Patent:

50051970, Apr 2, 1991

Filed:

Nov 30, 1989

Appl. No.:

7/444106

Inventors:

Gerald J. Parsons - Chester Springs PA
Brian D. Greenwald - Chester Springs PA
John J. McGrath - Kennett Square PA
Stephen W. Andrasko - Drexel Hill PA

Assignee:

Communications Test Design, Inc. - West Chester PA

International Classification:

H04M 326

US Classification:

379 21

Abstract:

A telephone line card tester operates by transmitting test data to the digital port of a telephone line interface card, and by subsequently receiving the data which is transmitted from this card through the same digital port. Once received, the data pattern is compared with an expected data pattern. A difference between the received data and the expected data is indicative of a defect in the telephone line interface card. To meet telephone line interface card timing consideration, the transmission of data to the interface card and the analysis of data received from the card are performed by separate subsystems. To accomplish this task, the telephone line interface card is tested in a test fixture which includes a digital line interface card tester, and a communications test set. The communications test set is used for such functions as ring generation and line simulation. The digital line interface card tester is used to exercise the line interface card in a variety of signalling scenarios which simulate the operational environment of the line card.

US Patent:

50292900, Jul 2, 1991

Filed:

Feb 2, 1990

Appl. No.:

7/473446

Inventors:

Donald F. Parsons - West Chester PA
Brian D. Greenwald - Chester Springs PA
John J. McGrath - Kennett Square PA
Michael Dudek - Philadelphia PA
Leo D. Parsons - Chester Springs PA

Assignee:

Communications Test Design, Inc. - West Chester PA

International Classification:

G08B 108

US Classification:

340533

Abstract:

An alarm system suitable for use in a telecommunications network in which a central switching system is capable of selectively providing a signal of a predetermined polarity to a plurality of remotely located stations without being dependent upon or impeding the ability of the central switching system to process relatively high volume communications traffic. Each of the remote stations is connected to the telecommunications network by an electrical conduction path. The stations are substantially unresponsive to the predetermined polarity signal. In response to an alarm indication signal, the system effects a reversal in the polarity of the signal provided to a selected subset of the remote stations. Each station in the selected subset responds to the polarity reversal by indicating an alarm condition.

US Patent:

20170278232, Sep 28, 2017

Filed:

Jan 18, 2017

Appl. No.:

15/409079

Inventors:

- West Chester PA, US
Michael P. Parsons - West Chester PA, US
Leo D. Parsons - Chester Springs PA, US
Nidhin Davis - Avondale PA, US
Andrew Sieben - Wilmington DE, US
Sean Parsons - West Chester PA, US
Mohammad R. Paknejad - Glenmoore PA, US
Marc Aurel Kamsu Tennou - West Chester PA, US
John J. McGrath - Kennett Square PA, US

Assignee:

Communications Test Design, Inc. - West Chester PA

International Classification:

G06T 7/00
G06K 9/46

Abstract:

A method for detecting defective pixels and screen imperfections is provided and include the steps of: positioning a mobile device having a display screen in a testing chamber, capturing an image of the display screen using a camera directed to a the display screen, and performing a perform a pixel detection analysis of the image.