US3271689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Demodulator for time modulated signals
Assignee: Bell and Howell Co
•
Filing: 1964-01-06
•
Granted: 1966-09-06
•
Expires: 1984-01-06
Abstract
No abstract record available.
Inventors
- 👤 Wayne K Hodder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:04
CPC Classifications
H; H03; H03K; H03K9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A DEMODULATOR CIRCUIT FOR DEMODULATING A CARRIER SIGNAL WHICH IS TIME MODULATED BY AN INFORMATION SIGNAL, THE DEMODULATOR INCLUDING A DETECTOR FOR GENERATING AN OUTPUT SIGNAL HAVING FREQUENCY COMPONENTS CORRESPONDING TO THE INFORMATION SIGNAL AND UNWANTED SIDE BANDS, A BAND-PASS FILTER FOR PASSING SIGNALS ON EITHER SIDE OF THE CARRIER FREQUENCY, THE OUTPUT OF THE DETECTOR BEING CONNECTED TO THE FILTER, A SQUARE-LAW NETWORK COUPLED TO THE OUTPUT OF THE BAND-PASS FILTER, A LOW-PASS FILTER FOR PASS-
Claim 2
Dependent Claim
77 words
A DEMODULATOR CIRCUIT FOR DEMODULATING A CARRIER SIGNAL WHICH IS TIME MODULATED BY AN INFORMATION SIGNAL, THE DEMODULATOR INCLUDING A DETECTOR FOR GENERATING AN OUTPUT SIGNAL HAVING FREQUENCY COMPONENTS CORRESPONDING TO THE INFORMATION SIGNAL AND UNWANTED SIDE BANDS, A BAND-PASS FILTER FOR PASSING SIGNALS ON EITHER SIDE OF THE CARRIER FREQUENCY, THE OUTPUT OF THE DETECTOR BEING CONNECTED TO THE FILTER, A SQUARE-LAW NETWORK COUPLED TO THE OUTPUT OF THE BAND-PASS FILTER, A LOW-PASS FILTER FOR PASS-
References Cited (Backward Citations)
US2716189A
Cited
US3163717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |