US3240879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm circuits in portable radio telephone system
Assignee: AT&T Inc
•
Filing: 1962-12-18
•
Granted: 1966-03-15
•
Expires: 1982-12-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:28
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
139 words
IN A WIRELESS TELEPHONE SYSTEM, A TELEPHONE CENTRAL OFFICE, A STATIONARY BASE STATION, A PORTABLE TELEPHONE STATION, SAID STATIONS EACH HAVING A RADIO TRANSMITTER AND A RADIO RECEIVER CREATING A TWO-WAY WIRELESS LINK BETWEEN STAIONS, A TELEPHONE TRANSMISSION FACILITY INTERCONNECTING SAID FIXED STATION WITH SAID CENTRAL OFFICE, MEANS AT SAID FIXED STATION REPRESENTING A BUSY LINE TO SAID CENTRAL ORIFICE DURING CALLS INVOLVING SAID PORTABLE STATION, A SOURCE OF COMMAND SIGNALS TRANSMISSIBLE OVER SAID WIRELESS LINK LOCATED AT SAID PORTABLE STATION, SID COMMAND SOURCE BEING ACTIVATED AT THE TERMINATION OF CALLS INVOLVING SAID PORTABLE STATION, MEANS AT SAID FIXED STATION RESPONSIVE TO SAID COMMAND SIGNAL FOR REPRESENTING AN IDLE LINE TO SAID CENTRAL OFFICE, AND MEANS LOCATED AT SAID PORTABLE STATION FOR GENERATING A SENSORY INDICATION OF THE FAILURE OF SAID COMMAND SIGNAL TO EFFECT SAID IDLE LINE PREPRESENTATION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |