PHELPS-TOINTON, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5370857 Process for producing monohydrated beta-ferric oxideExpiredApr 13, 93Dec 06, 94[C01G]
5003800 Door lock control system featuring a remote control for a pneumatically powered door lock mechanismExpiredJul 17, 89Apr 02, 91[E05B]
4913475 Security lock mechanismExpiredApr 18, 88Apr 03, 90[E05B]
4841283 Security hinge utilizing concealed radiative sensing to detect hinge positionExpiredDec 21, 87Jun 20, 89[G08B]
4776619 Sliding door lockExpiredMay 01, 86Oct 11, 88[E05B, E05C]
4691542 Door locking systemExpiredApr 09, 85Sep 08, 87[E05B, E05C]
4640108 DOOR LOCKING SYSTEMWithdrawnApr 09, 85Feb 03, 87[]
4509347 Door locking systemExpiredJun 30, 82Apr 09, 85[E05B, E05C]

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