US3142829A
Expired / Lapsed
US
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Checking method for digital magnetic tape systems employing double transition high density recording
Assignee: Potter Instrument Co Inc
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Filing: 1960-08-22
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Granted: 1964-07-28
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Expires: 1980-08-22
Abstract
No abstract record available.
Inventors
- 👤 George E Comstock
- 👤 Harbor Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:40
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10; G06F11/1008; G06F11/1012; G06F11/1032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A DIGITAL INFORMATION RECOVERY SYSTEM, THE COMBINATION OF, A TRANSDUCER FOR DERIVING INFORMATION-CONTAINING SIGNALS AND TIMING SIGNALS FROM A RECORDING MEDIUM, A PARITY CHECKING CIRCUIT FOR PROVIDING A SIGNAL IN RESPONSE TO A DETECTED PARITY ERROR, A CLOCK ERROR DETECTING CIRCUIT FOR PROVIDING A SIGNAL IN RESPONSE TO A DETECTED CLOCK ERROR, AN INFORMATION AND CLOCK RECOVERY CIRCUIT CONNECTED WITH SAID TRANSDUCER FOR PROVIDING INFORMATION-CONTAINING SIGNALS TO SAID PARITY CHECKING CIRCUIT AND TIMING SIGNALS TO SAID CLOCK ERROR DETECTING CIRCUIT, AN AND CIRCUIT, AND MEANS TO CONNECT A SIGNAL PROVIDED BY SAID PARITY CHECKING CIRCUIT AND A SIGNAL PROVIDED BY SAID CLOCK ERROR DETECTING CIRCUIT TO SAID AND CIRCUIT FOR PROVIDING A CORRECT SIGNAL OUTPUT IN RESPONSE
Claim 2
Dependent Claim
118 words
IN A DIGITAL INFORMATION RECOVERY SYSTEM, THE COMBINATION OF, A TRANSDUCER FOR DERIVING INFORMATION-CONTAINING SIGNALS AND TIMING SIGNALS FROM A RECORDING MEDIUM, A PARITY CHECKING CIRCUIT FOR PROVIDING A SIGNAL IN RESPONSE TO A DETECTED PARITY ERROR, A CLOCK ERROR DETECTING CIRCUIT FOR PROVIDING A SIGNAL IN RESPONSE TO A DETECTED CLOCK ERROR, AN INFORMATION AND CLOCK RECOVERY CIRCUIT CONNECTED WITH SAID TRANSDUCER FOR PROVIDING INFORMATION-CONTAINING SIGNALS TO SAID PARITY CHECKING CIRCUIT AND TIMING SIGNALS TO SAID CLOCK ERROR DETECTING CIRCUIT, AN AND CIRCUIT, AND MEANS TO CONNECT A SIGNAL PROVIDED BY SAID PARITY CHECKING CIRCUIT AND A SIGNAL PROVIDED BY SAID CLOCK ERROR DETECTING CIRCUIT TO SAID AND CIRCUIT FOR PROVIDING A CORRECT SIGNAL OUTPUT IN RESPONSE
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) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |