US3085210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonsearching automatic frequency control system
Assignee: Individual
•
Filing: 1960-08-11
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Granted: 1963-04-09
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Expires: 1980-08-11
Abstract
No abstract record available.
Inventors
- 👤 Marvin D Aasen
- 👤 John D Albright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:06
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
AN IMPROVED AUTOMATIC FREQUENCY CONTROL LOOP IN SUPERHETERODYNE ELECTROMAGNETIC WAVE COMMUNICATION SYSTEMS INCLUDING A FIRST MIXER STAGE AND AN INTERMEDIATE FREQUENCY AMPLIFIER STAGE THEREIN OPERATING TO MAINTAIN THE FIRST MIXER STAGE OUTPUT INTERMEDIATE FREQUENCY CONSTANT, THE INVENTION WHICH COMPRISES: A SECOND MIXER STAGE COUPLED BETWEEN SAID FIRST MIXER STAGE AND SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE; AND A REFERENCE OSCILLATOR COUPLED TO SAID SECOND MIXER STAGE FOR MIXING THE CONSTANT INTERMEDIATE FREQUENCY OUTPUT OF SAID FIRST MIXER STAGE AND SAID REFERENCE OSCILLATOR OUTPUT TO PRODUCE A CONSTANT SECOND INTERMEDIATE FREQUENCY HIGHER THAN SAID INTERMEDIATE FREQUENCY OF SAID FIRST MIXER STAGE, SAID REFERENCE OSCILLATOR OUTPUT FREQUENCY BEING SUFFICIENTLY HIGH TO PROVIDE A LOW RATIO OF BANDWIDTH TO CENTER FREQUENCY OF SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE, AND THE CENTER FREQUENCY OF SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE IS EQUAL TO SAID SECOND INTERMEDIATE FREQUENCY.
Claim 2
Dependent Claim
140 words
AN IMPROVED AUTOMATIC FREQUENCY CONTROL LOOP IN SUPERHETERODYNE ELECTROMAGNETIC WAVE COMMUNICATION SYSTEMS INCLUDING A FIRST MIXER STAGE AND AN INTERMEDIATE FREQUENCY AMPLIFIER STAGE THEREIN OPERATING TO MAINTAIN THE FIRST MIXER STAGE OUTPUT INTERMEDIATE FREQUENCY CONSTANT, THE INVENTION WHICH COMPRISES: A SECOND MIXER STAGE COUPLED BETWEEN SAID FIRST MIXER STAGE AND SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE; AND A REFERENCE OSCILLATOR COUPLED TO SAID SECOND MIXER STAGE FOR MIXING THE CONSTANT INTERMEDIATE FREQUENCY OUTPUT OF SAID FIRST MIXER STAGE AND SAID REFERENCE OSCILLATOR OUTPUT TO PRODUCE A CONSTANT SECOND INTERMEDIATE FREQUENCY HIGHER THAN SAID INTERMEDIATE FREQUENCY OF SAID FIRST MIXER STAGE, SAID REFERENCE OSCILLATOR OUTPUT FREQUENCY BEING SUFFICIENTLY HIGH TO PROVIDE A LOW RATIO OF BANDWIDTH TO CENTER FREQUENCY OF SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE, AND THE CENTER FREQUENCY OF SAID INTERMEDIATE FREQUENCY AMPLIFIER STAGE IS EQUAL TO SAID SECOND INTERMEDIATE FREQUENCY.
References Cited (Backward Citations)
US2550519A
Cited
US2921271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-08 | 1966-10-08 | 1967-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-08 | 1970-10-08 | 1971-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-08 | 1974-10-08 | 1975-04-09 | $7700.00 | Window Closed / Lapsed |