IP Library › Granted Patent US 4,799,255
Granted Patent Utility
US 4,799,255 · App. 07/009,175

Communication facilities access control arrangement

Inventors: Randy J. Billinger, Laurel K. Dotter, Tommy D. Gasaway
Patented Case View Patent ↗
Granted: Jan 17, 1989 Filed: Jan 30, 1987
Inventors
Randy J. Billinger
Laurel K. Dotter
Tommy D. Gasaway
Assignee (at issue)
American Telephone and Telegraph Company, AT&T Information Systems

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Quick Facts
Patent No.
US 4,799,255
App. No.
07/009,175
Filed
1987-01-30
Granted
1989-01-17
Kind
A