US3375326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video d.c. insertion circuit
Assignee: Rank Bush Murphy Ltd
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Filing: 1964-08-20
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Granted: 1968-03-26
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Expires: 1984-08-20
Abstract
No abstract record available.
Inventors
- 👤 Baldwin John Lewis Edwin
- 👤 Parkyn Derek John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A VIDEO SIGNAL PROCESSOR COMPRISING THE COMBINATION OF: A FIRST SOURCE OF VIDEO SIGNALS HAVING A PREDETERMINED FREQUENCY RANGE INCLUDING ZERO FREQUENCY AND HAVING A CORRECT ZERO-FREQUENCY COMPONENT; A SECOND SOURCE OF MODIFIED VIDEO SIGNALS HAVING SAID PREDETERMINED FREQUENCY RANGE AND HAVING A DIRECT-CURRENT COMPONENT WHICH IS NOT SAID CORRECT COMPONENT; A COMBINING NETWORK HAVING FIRST AND SECOND INPUT PORTS AND AN OUTPUT PORT; A FIRST SIGNAL PATH HAVING A PREDETERMINED VARIATION OF RESPONSE WITH SIGNAL FREQUENCY OVER SAID PREDETERMINED FREQUENCY RANGE INCLUDING FINITE RESPONSE AT ZERO SIGNAL FREQUENCY WITHIN SAID NETWORK FROM SAID FIRST INPUT PORT TO SAID OUTPUT PORT; A SECOND SIGNAL PATH WITHIN SAID NETWORK FROM SAID SECOND INPUT PORT TO SAID OUTPUT PORT, SAID SECOND PATH HAVING A VARIATION OF RESPONSE WITH SIGNAL FREQUENCY OVER SAID PREDETERMINED FREQUENCY RANGE WHICH IS COMPLEMENTARY TO THAT OF SAID FIRST PATH INCLUDING ZERO RESPONSE AT ZERO SIGNAL FREQUENCY; CIRCUIT MEANS APPLYING SIGNALS FROM SAID FIRST SOURCE TO SAID FIRST INPUT PORT; CIRCUIT MEANS APPLYING SIGNALS FROM SAID SECOND SOURCE TO SAID SECOND INPUT PORT; AND CIRCUIT MEANS FOR DERIVING SAID PROCESSED VIDEO SIGNAL FROM SAID OUTPUT PORT.
Claim 2
Dependent Claim
188 words
A VIDEO SIGNAL PROCESSOR COMPRISING THE COMBINATION OF: A FIRST SOURCE OF VIDEO SIGNALS HAVING A PREDETERMINED FREQUENCY RANGE INCLUDING ZERO FREQUENCY AND HAVING A CORRECT ZERO-FREQUENCY COMPONENT; A SECOND SOURCE OF MODIFIED VIDEO SIGNALS HAVING SAID PREDETERMINED FREQUENCY RANGE AND HAVING A DIRECT-CURRENT COMPONENT WHICH IS NOT SAID CORRECT COMPONENT; A COMBINING NETWORK HAVING FIRST AND SECOND INPUT PORTS AND AN OUTPUT PORT; A FIRST SIGNAL PATH HAVING A PREDETERMINED VARIATION OF RESPONSE WITH SIGNAL FREQUENCY OVER SAID PREDETERMINED FREQUENCY RANGE INCLUDING FINITE RESPONSE AT ZERO SIGNAL FREQUENCY WITHIN SAID NETWORK FROM SAID FIRST INPUT PORT TO SAID OUTPUT PORT; A SECOND SIGNAL PATH WITHIN SAID NETWORK FROM SAID SECOND INPUT PORT TO SAID OUTPUT PORT, SAID SECOND PATH HAVING A VARIATION OF RESPONSE WITH SIGNAL FREQUENCY OVER SAID PREDETERMINED FREQUENCY RANGE WHICH IS COMPLEMENTARY TO THAT OF SAID FIRST PATH INCLUDING ZERO RESPONSE AT ZERO SIGNAL FREQUENCY; CIRCUIT MEANS APPLYING SIGNALS FROM SAID FIRST SOURCE TO SAID FIRST INPUT PORT; CIRCUIT MEANS APPLYING SIGNALS FROM SAID SECOND SOURCE TO SAID SECOND INPUT PORT; AND CIRCUIT MEANS FOR DERIVING SAID PROCESSED VIDEO SIGNAL FROM SAID OUTPUT PORT.
References Cited (Backward Citations)
US3085131A
Cited
US3333055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |