Patent US3233181A successfully refreshed from Google Patents.
US3233181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency shift signal demodulator
Assignee: International Business Machines Corp
•
Filing: 1963-01-28
•
Granted: 1966-02-01
•
Expires: 1983-01-28
Abstract
No abstract record available.
Inventors
- 👤 Richard W Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/156; H04L27/1563
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A DEMODULATOR FOR DERIVING DIGITAL INFORMATION FROM A FREQUENCY SHIFT MODULATED WAVE, INCLUDING THE COMBINATION OF FIRST MEANS FOR GENERATING A PULSE CORRESPONDING TO EACH TRANSITION OF SAID FREQUENCY SHIFT MODULATED WAVE IN A FIRST GIVEN DIRECTION, SECOND MEANS FOR GENERATING A PULSE CORRESPONDING TO EACH TRANSITION OF SAID FREQUENCY SHIFT MODULATED WAVE IN A SECOND GIVEN DIRECTION, AND GATING MEANS COUPLED TO SAID FIRST AND SECOND PULSE GENERATING MEANS FOR PASSING THE PULSE FROM SAID SECOND PULSE GENERATING MEANS TO ONE OF TWO OUTPUT TERMINALS IN ACCORDANCE WITH THE FREQUENCY OF SAID FREQUENCY SHIFT MODULATED WAVE.
Claim 2
Dependent Claim
97 words
A DEMODULATOR FOR DERIVING DIGITAL INFORMATION FROM A FREQUENCY SHIFT MODULATED WAVE, INCLUDING THE COMBINATION OF FIRST MEANS FOR GENERATING A PULSE CORRESPONDING TO EACH TRANSITION OF SAID FREQUENCY SHIFT MODULATED WAVE IN A FIRST GIVEN DIRECTION, SECOND MEANS FOR GENERATING A PULSE CORRESPONDING TO EACH TRANSITION OF SAID FREQUENCY SHIFT MODULATED WAVE IN A SECOND GIVEN DIRECTION, AND GATING MEANS COUPLED TO SAID FIRST AND SECOND PULSE GENERATING MEANS FOR PASSING THE PULSE FROM SAID SECOND PULSE GENERATING MEANS TO ONE OF TWO OUTPUT TERMINALS IN ACCORDANCE WITH THE FREQUENCY OF SAID FREQUENCY SHIFT MODULATED WAVE.
References Cited (Backward Citations)
US2716189A
Cited
US2904683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |