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Bell Telephone Company of Canada
Bell Telep
Active Patents
0
Total Holdings
3
Patent Holdings
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Patent No.
Title
Status
Filing Date
Grant Date
Claims
Actions
US3573378A
Telephone call timing circuit
Expired / Lapsed
1968-04-11
1971-04-06
7
Details
US3542968A
Paging system
Expired / Lapsed
1968-02-16
1970-11-24
0
Details
US3288929A
Transmission line break detecting circuit
Expired / Lapsed
1965-06-21
1966-11-29
2
Details