US3588855A
Expired / Lapsed
US
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Data gap responding apparatus
Assignee: International Business Machines Corp
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Filing: 1968-10-14
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Granted: 1971-06-28
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Expires: 1988-10-14
Abstract
Abstract GAPS IN A STREAM OF DATA FROM A READING STATION ASSOCIATED WITH A RECORDING MEDIUM SUCH AS A MAGNETIC TAPE ARE TESTED TO DETERMINED WHETHER OR NOT THEY REPRESENT POSITIVE INFORMATION SUCH AS AN INTERBLOCK GAP. DETECTION OF A GAP DURING A WRITE CHECK OPERATION CAUSES IMMEDIATE CESSATION OF THE WRITE OPERATION. WHEN INTERPRETING GAPS, DETECTION OF A GAP IN THE DATA INITIATES A TIMEOUT OPERATION WHICH IS ABORTED IF DATA REAPPEARS BEFORE THE TIMEOUT IS COMPLETED. THE OUTPUT OF THE TIMEOUT CIRCUITRY INDICATES THAT FURTHER DATA READING SHOULD BE EFFECTED OR THAT A POSITIVE BLOCK SUCH AS AN INTERBLOCK GAP HAS BEEN ENCOUNTERED.
Inventors
- 👤 Richard F Scully
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:25
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/22; G11B20/10; G11B20/18; G11B20/12; G11B2020/1264; G11B2020/1265; G11B2020/1277; G11B2220/00; G11B2220/90
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |