US3911477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color video tape recorder utilizing a color subcarrier oscillator as an erasing signal
Assignee: US Philips Corp
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Filing: 1973-11-21
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Granted: 1975-10-07
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Expires: 1993-11-21
Abstract
Abstract The invention relates to a recording and/or playback apparatus for colour video signals in which an oscillator included in the apparatus for generating the colour subcarrier is also used as a source of erase signals for supplying an erase head, preferably a rotating erase head.
Inventors
- 👤 Robert Lackner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:13
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/029
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
Recording and/or playback apparatus for color video signals of the type having a rotating head assembly which scans tracks on a record carrier and comprises at least one record and/or playback head, at least one erase head for trackwise erasing a recorded video signal, the improvement wherein an oscillator synchronized with the color synchronizing signal of the color video signal is provided for generating a color subcarrier and is selectively connected to the erase head to supply the latter.
Claim 2
Dependent Claim
79 words
Recording and/or playback apparatus for color video signals of the type having a rotating head assembly which scans tracks on a record carrier and comprises at least one record and/or playback head, at least one erase head for trackwise erasing a recorded video signal, the improvement wherein an oscillator synchronized with the color synchronizing signal of the color video signal is provided for generating a color subcarrier and is selectively connected to the erase head to supply the latter.
Claim 3
Dependent Claim
19 words
Apparatus as claimed in claim 1, wherein a frequency converter is included between the oscillator and the erase head.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |