US3230306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing system
Assignee: Victor Company of Japan Ltd
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Filing: 1962-04-23
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Granted: 1966-01-18
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Expires: 1982-04-23
Abstract
No abstract record available.
Inventors
- 👤 Takayanagi Kenjiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:02
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A MAGNETIC RECORDING AND REPRODUCING METHOD FOR RECORDING AND REPRODUCING TELEVISION VIDEO SIGNALS OR ANY OTHER WIDE-BAND SIGNALS ON A MAGNETIC MEDIUM CHARACTERIZED BY FREQUENCY-MODULATING A CARRIER OF RELATIVELY HIGHER FREQUENCY WITH A SIGNAL TO BE RECORDED, THEN HETERODYNING THE MODULATED SIGNAL AGAINST A FIXED FREQUENCY SIGNAL SO AS TO GIVE A FREQUENCY-SHIFT AND TO SET A CENTER FREQUENCY OF THE FREQUENCY-DEVIATION IN THE CARRIER SUBSTANTIALLY EQUAL TO OR LOWER THAN THE MAXIMUM FREQUENCY OF THE SIGNAL TO BE RECORDED, RECORDING THE FREQUENCY-DEVIATED SIGNAL ON A MAGNETIC MEDIUM AND REPRODUCING THE RECORDED SIGNAL BY DEMODULATING AFTER PICKING UP THE SIGNAL FROM THE MAGNETIC MEDIUM.
Claim 2
Dependent Claim
104 words
A MAGNETIC RECORDING AND REPRODUCING METHOD FOR RECORDING AND REPRODUCING TELEVISION VIDEO SIGNALS OR ANY OTHER WIDE-BAND SIGNALS ON A MAGNETIC MEDIUM CHARACTERIZED BY FREQUENCY-MODULATING A CARRIER OF RELATIVELY HIGHER FREQUENCY WITH A SIGNAL TO BE RECORDED, THEN HETERODYNING THE MODULATED SIGNAL AGAINST A FIXED FREQUENCY SIGNAL SO AS TO GIVE A FREQUENCY-SHIFT AND TO SET A CENTER FREQUENCY OF THE FREQUENCY-DEVIATION IN THE CARRIER SUBSTANTIALLY EQUAL TO OR LOWER THAN THE MAXIMUM FREQUENCY OF THE SIGNAL TO BE RECORDED, RECORDING THE FREQUENCY-DEVIATED SIGNAL ON A MAGNETIC MEDIUM AND REPRODUCING THE RECORDED SIGNAL BY DEMODULATING AFTER PICKING UP THE SIGNAL FROM THE MAGNETIC MEDIUM.
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) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |