Patent US3217329A successfully refreshed from Google Patents.
US3217329A
Expired / Lapsed
US
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Dual track high density recording system
Assignee: Potter Instrument Co Inc
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Filing: 1960-05-03
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Granted: 1965-11-09
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Expires: 1980-05-03
Abstract
No abstract record available.
Inventors
- 👤 Gabor Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:41
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1803; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
56 words
IN A DIGITAL INFORMATION RECORDING AND RECOVERY SYSTEM, THE COMBINATION OF, A SOURCE OF CLOCK PULSES, A SOURCE OF INFORMATION PULSES SYNCHRONIZED WITH SAID CLOCK PULSES, MEANS FOR MIXING SAID CLOCK AND INFORMATION PULSES, MEANS FOR GENERATING RECORDING CURRENT IN ACCORDANCE WITH SAID MIXED PULSES, DUAL-TRACK REDUNDANT RECORDING MEDANS FOR RECORDING TWO TRACKS ON MAGNETIC TAPE
References Cited (Backward Citations)
US2853357A
Cited
US2813259A
Cited
US2896192A
Cited
GB792294A
Cited
US2923589A
Cited
US2898578A
Cited
US2900215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |