US3323737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tape drive systems
Assignee: Ampex Corp
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Filing: 1965-02-24
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Granted: 1967-06-06
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Expires: 1985-02-24
Abstract
No abstract record available.
Inventors
- 👤 Elsbach Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:27
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A PNEUMATIC DRIVE SYSTEM FOR ADVANCING A WEB MATERIAL IN A CONTROLLED PATH PAST AN OPERATING ASSEMBLY COMPRISING MEANS FOR GENERATING AN ACTUATING SIGNAL INDICATIVE OF TAPE SPEED, FIRST AND SECOND DIFFERENTIAL PRESSURE CHAMBERS FOR FORMING LOW INERTIA WEB MATERIAL LOOPS ON EITHER SIDE OF THE OPERATING ASSEMBLY, SAID FIRST AND SECOND DIFFERENTIAL PRESSURE CHAMBERS HAVING SUBSTANTIALLY PARALLEL SIDE WALLS MOVABLE WITH RESPECT TO ONE ANOTHER FOR VARYING THE TENSION ON THE LOOPS IN RESPONSE TO SAID ACTUATING SIGNAL, AND MEANS RESPONSIVE TO THE LENGTHS OF THE LOOPS WITHIN THE CHAMBERS FOR MAINTAINING THE LOOPS AT DESIRED LENGTHS WITHIN THE FIRST AND SECOND CHAMBERS.
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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |