Patent US3740969A successfully refreshed from Google Patents.
Patent US3142801A successfully refreshed from Google Patents.
US3142801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable call-signal receiver with power saving means
Assignee: Siemens Schweiz AG
•
Filing: 1961-09-21
•
Granted: 1964-07-28
•
Expires: 1981-09-21
Abstract
No abstract record available.
Inventors
- 👤 Konig Heinrich
- 👤 Tschannen Gottfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:29
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PORTABLE CALL-SIGNAL RECEIVER, COMPRISING A TRANSISTOR PRE-STAGE AND AN END-STAGE, AN ANTENNA TUNED TO THE CALL FREQUENCY FOR ENERGIZING SAID PRE-STAGE, A SWITCH CONTROLLED BY THE CALL-SIGNAL AMPLIFIED IN THE PRE-STAGE AND CONNECTED TO SAID END-STAGE TO PLACE IT IN OPERATION, SAID PRE-STAGE INCLUDING MEANS RESPONSIVE TO SWITCHING OF SAID SWITCH FOR MAINTAINING OTHER THAN CLASS-A AMPLIFIER OPERATION IN SAID PRE-STAGE PRIOR TO AND DURING THE SWITCHING OF SAID SWITCH AND FOR TRANSFERRING SAID PRE-STAGE TO CLASS-A OPERATION SIMULTANEOUSLY WITH PLACING THE ENDSTAGE INTO OPERATIVE CONDITION, SAID PRE-STAGE PRESENTING TO SAID ANTENNA A HIGHER INPUT IMPEDANCE DURING THE OTHER THAN CLASS-A OPERATION AND A LOW INPUT IMPEDANCE DURING CLASS-A OPERATION.
Claim 2
Dependent Claim
111 words
A PORTABLE CALL-SIGNAL RECEIVER, COMPRISING A TRANSISTOR PRE-STAGE AND AN END-STAGE, AN ANTENNA TUNED TO THE CALL FREQUENCY FOR ENERGIZING SAID PRE-STAGE, A SWITCH CONTROLLED BY THE CALL-SIGNAL AMPLIFIED IN THE PRE-STAGE AND CONNECTED TO SAID END-STAGE TO PLACE IT IN OPERATION, SAID PRE-STAGE INCLUDING MEANS RESPONSIVE TO SWITCHING OF SAID SWITCH FOR MAINTAINING OTHER THAN CLASS-A AMPLIFIER OPERATION IN SAID PRE-STAGE PRIOR TO AND DURING THE SWITCHING OF SAID SWITCH AND FOR TRANSFERRING SAID PRE-STAGE TO CLASS-A OPERATION SIMULTANEOUSLY WITH PLACING THE ENDSTAGE INTO OPERATIVE CONDITION, SAID PRE-STAGE PRESENTING TO SAID ANTENNA A HIGHER INPUT IMPEDANCE DURING THE OTHER THAN CLASS-A OPERATION AND A LOW INPUT IMPEDANCE DURING CLASS-A OPERATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |