Patent US3175158A successfully refreshed from Google Patents.
US3175158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled decay feedback type comb filters
Assignee: Individual
•
Filing: 1961-05-25
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Granted: 1965-03-23
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Gail T Flesher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:25
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A COMB FILTER COMPRISING: SIGNAL INPUT MEANS; SIGNAL OUTPUT MEANS; ADDER MEANS COUPLED BETWEEN SAID INPUT AND OUTPUT MEANS; FIRST SIGNAL DELAY MEANS COUPLED BETWEEN SAID OUTPUT MEANS AND SAID ADDER MEANS; A SECOND SIGNAL DELAY MEANS COUPLED TO SAID OUTPUT MEANS; A SUBTRACT CIRCUIT COUPLED TO SAID OUTPUT MEANS AND TO SAID SECOND DELAY MEANS; A PULSE CANCELLER COUPLED TO SAID SUBTRACT CIRCUIT AND TO SAID FIRST DELAY MEANS.
Claim 2
Dependent Claim
70 words
A COMB FILTER COMPRISING: SIGNAL INPUT MEANS; SIGNAL OUTPUT MEANS; ADDER MEANS COUPLED BETWEEN SAID INPUT AND OUTPUT MEANS; FIRST SIGNAL DELAY MEANS COUPLED BETWEEN SAID OUTPUT MEANS AND SAID ADDER MEANS; A SECOND SIGNAL DELAY MEANS COUPLED TO SAID OUTPUT MEANS; A SUBTRACT CIRCUIT COUPLED TO SAID OUTPUT MEANS AND TO SAID SECOND DELAY MEANS; A PULSE CANCELLER COUPLED TO SAID SUBTRACT CIRCUIT AND TO SAID FIRST DELAY MEANS.
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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |