US3286184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable telephone system
Assignee: AT&T Inc
•
Filing: 1963-09-11
•
Granted: 1966-11-15
•
Expires: 1983-09-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank H Blitchington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A COMBINED AUDIO-RADIO FREQUENCY TELEPHONE SYSTEM FOR RECEIVING AND IMPRESSING AUDIO SIGNALS ON A TELEPHONE LINE, A FIRST UNIT HAVING A FIRST INDUCTIVE LOOP, A TRANSMITTER AND A RECEIVER IN SAID FIRST UNIT, MEANS INTERPOSED BETWEEN SAID TRANSMITTER AND SAID FIRST INDUCTIVE LOOP FOR GENERATING R.F. SIGNALS MODULATED IN ACCORDANCE WITH SIGNALS IMPRESSED ON SAID TRANSMITTER, AN AUDIO AMPLIFIER MEANS INTERPOSED BETWEEN SAID FIRST LOOP AND SAID RECEIVER FOR AMPLIFYING AUDIO FREQUENCY SIGNALS RECEIVED IN SAID FIRST LOOP, A SECOND INDUCTIVE LOOP INDUCTIVELY COUPLED TO SAID FIRST INDUCTIVE LOOP, MEANS FOR TUNING SAID SECOND LOOP TO RESPOND TO SAID GENERATED R.F. SIGNALS, A NORMALLY OPEN CONTACT IN SAID TELEPHONE LINE, MEANS RESPONSIVE TO THE RECEIPT OF AN R.F. SIGNAL IN
Claim 2
Dependent Claim
121 words
IN A COMBINED AUDIO-RADIO FREQUENCY TELEPHONE SYSTEM FOR RECEIVING AND IMPRESSING AUDIO SIGNALS ON A TELEPHONE LINE, A FIRST UNIT HAVING A FIRST INDUCTIVE LOOP, A TRANSMITTER AND A RECEIVER IN SAID FIRST UNIT, MEANS INTERPOSED BETWEEN SAID TRANSMITTER AND SAID FIRST INDUCTIVE LOOP FOR GENERATING R.F. SIGNALS MODULATED IN ACCORDANCE WITH SIGNALS IMPRESSED ON SAID TRANSMITTER, AN AUDIO AMPLIFIER MEANS INTERPOSED BETWEEN SAID FIRST LOOP AND SAID RECEIVER FOR AMPLIFYING AUDIO FREQUENCY SIGNALS RECEIVED IN SAID FIRST LOOP, A SECOND INDUCTIVE LOOP INDUCTIVELY COUPLED TO SAID FIRST INDUCTIVE LOOP, MEANS FOR TUNING SAID SECOND LOOP TO RESPOND TO SAID GENERATED R.F. SIGNALS, A NORMALLY OPEN CONTACT IN SAID TELEPHONE LINE, MEANS RESPONSIVE TO THE RECEIPT OF AN R.F. SIGNAL IN
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |