Patent US3288336A successfully refreshed from Google Patents.
US3288336A
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Tape transport control systems and methods
Assignee: Schlumberger Well Surveying Corp
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Filing: 1964-10-05
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Granted: 1966-11-29
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Expires: 1984-10-05
Abstract
No abstract record available.
Inventors
- 👤 John S Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:38
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A TAPE TRANSPORT CONTROL SYSTEN FOR SYNCHRONIZING THE RATE OF MOVEMENT OF A MAGNETIC RECORDING TAPE WITH THE VARIABLE FREQUENCY SIGNAL COMPRISING: TAPE TRANSPORT MEANS INCLUDING CAPSTAN MEANS FOR MOVING THE MAGNETIC TAPE DIRECT-CURRENT MOTOR MEANS FOR DRIVING THE CAPSTAN MEANS; MAGNETIC READING HEAD MEANS FOR DETECTING PRE-RECORDED AND EVENLY SPACED MAGNETIC REFERENCE MARKS ON THE TAPE; CIRCUIT MEANS FOR COMPARING THE DETECTED REFERENCE MARKS AND THE VARIABLE FREQUENCY SIGNAL FOR DEVELOPING A CONTROL SIGNAL WHICH IS DEPENDENT ON THE DEGREE OF SYNCHRONIZATION THEREBETWEEN; AND CIRCUIT MEANS FOR SUPPLYING THE CONTROL SIGNAL TO THE DIRECT-CURRENT MOTOR MEANS FOR CONTROLLING THE SPEED THEREOF FOR RENDERING THE TATE OF MOVEMENT OF THE TAPE PROPORTIONAL TO THE FREQUENCY OF THE PERIODIC SIGNAL.
Claim 2
Dependent Claim
119 words
A TAPE TRANSPORT CONTROL SYSTEN FOR SYNCHRONIZING THE RATE OF MOVEMENT OF A MAGNETIC RECORDING TAPE WITH THE VARIABLE FREQUENCY SIGNAL COMPRISING: TAPE TRANSPORT MEANS INCLUDING CAPSTAN MEANS FOR MOVING THE MAGNETIC TAPE DIRECT-CURRENT MOTOR MEANS FOR DRIVING THE CAPSTAN MEANS; MAGNETIC READING HEAD MEANS FOR DETECTING PRE-RECORDED AND EVENLY SPACED MAGNETIC REFERENCE MARKS ON THE TAPE; CIRCUIT MEANS FOR COMPARING THE DETECTED REFERENCE MARKS AND THE VARIABLE FREQUENCY SIGNAL FOR DEVELOPING A CONTROL SIGNAL WHICH IS DEPENDENT ON THE DEGREE OF SYNCHRONIZATION THEREBETWEEN; AND CIRCUIT MEANS FOR SUPPLYING THE CONTROL SIGNAL TO THE DIRECT-CURRENT MOTOR MEANS FOR CONTROLLING THE SPEED THEREOF FOR RENDERING THE TATE OF MOVEMENT OF THE TAPE PROPORTIONAL TO THE FREQUENCY OF THE PERIODIC SIGNAL.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |