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King of Prussia, PA, United States of America

Check Mate Systems, Inc.

USPTO Granted Patents = 2

Trademarks = 1

Forward Citations = 69

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1 inventor (with patents filed for the assignee):

Terry A Keifer (2 out of 3 patents)

2 patents: Sort by Forward Citations

1. 4620182 - Security apparatus for retail goods (1986-10-28),

2. 4380097 - Product monitoring device (1983-04-19),

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USPTO Data Jan 1 1976 - Sep 29 2026

2 Patents

#43 in King of Prussia, PA

#3,422 in Pennsylvania

#94,730 in US

King of Prussia, PA, United States of America

Check Mate Systems, Inc.

Forward Citations = 69

1 inventor:

Terry A Keifer (2 out of 3 patents)

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