Patent US3829818A successfully refreshed from Google Patents.
Patent US3319901A successfully refreshed from Google Patents.
US3319901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loop control system for tape transports
Assignee: Ampex Corp
•
Filing: 1963-04-17
•
Granted: 1967-05-16
•
Expires: 1983-04-17
Abstract
No abstract record available.
Inventors
- 👤 Harold A Kurth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:32
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
IN A TAPE TRANSPORT SYSTEM INCLUDING VACUUM CHAMBERS PROVIDING LOW INERTIA TAPE LOOPS IN THE TAPE PATH BETWEEN THE STORAGE REELS AND THE TAPE DRIVING MECHANISM, A SERVO SYSTEM FOR MAINTAINING A PREDETERMINED LOOP POSITION COMPRISING MEANS FOR SENSING THE LENGTH OF THE TAPE LOOP AND PROVIDING A BILEVEL POSITION SIGNAL INDICATIVE OF THE LENGTH RELATIVE TO THE PREDETERMINED LOOP POSITION, SERVO MEANS FOR DRIVING SAID TAPE AT A SPEED IN ACCORDANCE WITH THE MAGNITUDE OF A DRIVING SIGNAL, TACHOMETER MEANS PROVIDING A SIGNAL PROPORTIONAL TO THE VELOCITY OF THE TAPE, MEANS FOR PROVIDING A COMMAND SIGNAL REPRESENTING THE DIRECTION OF TAPE TRAVEL, AND SIGNAL ADDER MEANS FOR ALGEBRAICALLY COMBINING SAID COMMAND SIGNAL, SAID POSITION SIGNAL, AND SAID VELOCITY SIGNAL TO PROVIDE A DRIVING SIGNAL TO THE SERVO MEANS FOR VARYING THE TAPE SPEEDS TO MAINTAIN THE DESIRED TAPE LENGTH OSCILLATING UNDER POSITIVE CONTROL AT THE PREDETERMINED LOOP POSITION.
Claim 2
Dependent Claim
149 words
IN A TAPE TRANSPORT SYSTEM INCLUDING VACUUM CHAMBERS PROVIDING LOW INERTIA TAPE LOOPS IN THE TAPE PATH BETWEEN THE STORAGE REELS AND THE TAPE DRIVING MECHANISM, A SERVO SYSTEM FOR MAINTAINING A PREDETERMINED LOOP POSITION COMPRISING MEANS FOR SENSING THE LENGTH OF THE TAPE LOOP AND PROVIDING A BILEVEL POSITION SIGNAL INDICATIVE OF THE LENGTH RELATIVE TO THE PREDETERMINED LOOP POSITION, SERVO MEANS FOR DRIVING SAID TAPE AT A SPEED IN ACCORDANCE WITH THE MAGNITUDE OF A DRIVING SIGNAL, TACHOMETER MEANS PROVIDING A SIGNAL PROPORTIONAL TO THE VELOCITY OF THE TAPE, MEANS FOR PROVIDING A COMMAND SIGNAL REPRESENTING THE DIRECTION OF TAPE TRAVEL, AND SIGNAL ADDER MEANS FOR ALGEBRAICALLY COMBINING SAID COMMAND SIGNAL, SAID POSITION SIGNAL, AND SAID VELOCITY SIGNAL TO PROVIDE A DRIVING SIGNAL TO THE SERVO MEANS FOR VARYING THE TAPE SPEEDS TO MAINTAIN THE DESIRED TAPE LENGTH OSCILLATING UNDER POSITIVE CONTROL AT THE PREDETERMINED LOOP POSITION.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |