US3213193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing system for video signals
Assignee: NEC Corp
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Filing: 1961-08-01
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Granted: 1965-10-19
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Expires: 1981-08-01
Abstract
No abstract record available.
Inventors
- 👤 Konishi Tatsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/008; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/95
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A MAGNETIC RECORDING AND REPRODUCING SYSTEM COMPRISING MEANS ADAPTED TO RECORD VIDEO SIGNALS ON A MAGNETIC STORAGE SURFACE, SAID MEANS BEING ADAPTED TO STORE ONE PORTION OF SAID VIDEO SIGNALS AT TWO SEPARATE PHYSICAL LOCATIONS ON SAID STORAGE SURFACE, MEANS ADAPTED TO REPRODUCE THE SIGNAL STORED ON SAID MAGNETIC STORAGE SURFACE, SAID REPRODUCING MEANS BEING ADAPTED TO SIMULATANEOUSLY, REPRODUCE SAID SIGNALS STORED IN SAID TWO SEPARATE LOCATIONS, MEANS ADAPTED TO COMPARE THE SIGNAL REPRODUCED FROM ONE OF SAID LOCATIONS WITH THE SIGNAL REPRODUCED FROM THE OTHER OF SAID LOCATIONS AND TO GENERATE A PHASE DIFFERENTIAL SIGNAL INDICIA-THE PHASE DIFFERENCE BETWEEN SAID TWO SIGNALS, SAID PHASE DIFFERENCE SIGNAL INDICATING A CHANGE IN THE PHYSICAL DIMENSIONS OF SAID MAGNETIC STORAGE SURFACE, AND MEANS ADAPTED TO CHANGE THE PHYSICAL DIMENSIONS OF SAID STORAGE SURFACE TO COUNTERACT FOR VARIATIONS DETECTED THEREIN.
Claim 2
Dependent Claim
137 words
A MAGNETIC RECORDING AND REPRODUCING SYSTEM COMPRISING MEANS ADAPTED TO RECORD VIDEO SIGNALS ON A MAGNETIC STORAGE SURFACE, SAID MEANS BEING ADAPTED TO STORE ONE PORTION OF SAID VIDEO SIGNALS AT TWO SEPARATE PHYSICAL LOCATIONS ON SAID STORAGE SURFACE, MEANS ADAPTED TO REPRODUCE THE SIGNAL STORED ON SAID MAGNETIC STORAGE SURFACE, SAID REPRODUCING MEANS BEING ADAPTED TO SIMULATANEOUSLY, REPRODUCE SAID SIGNALS STORED IN SAID TWO SEPARATE LOCATIONS, MEANS ADAPTED TO COMPARE THE SIGNAL REPRODUCED FROM ONE OF SAID LOCATIONS WITH THE SIGNAL REPRODUCED FROM THE OTHER OF SAID LOCATIONS AND TO GENERATE A PHASE DIFFERENTIAL SIGNAL INDICIA-THE PHASE DIFFERENCE BETWEEN SAID TWO SIGNALS, SAID PHASE DIFFERENCE SIGNAL INDICATING A CHANGE IN THE PHYSICAL DIMENSIONS OF SAID MAGNETIC STORAGE SURFACE, AND MEANS ADAPTED TO CHANGE THE PHYSICAL DIMENSIONS OF SAID STORAGE SURFACE TO COUNTERACT FOR VARIATIONS DETECTED THEREIN.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |