US3131395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-spaced magnetic disc recorder
Assignee: Alwac International Inc
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Filing: 1954-04-02
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Granted: 1964-04-28
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Expires: 1974-04-02
Abstract
No abstract record available.
Inventors
- 👤 John P Lekas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A MAGNETIC DISC RECORDER, A FIRST DISC ADAPTED TO BE ROTATED RELATIVE TO A SECOND DISC, MAGNETIC HEADS DISPOSED IN ONE OF SAID DISCS, A MAGNETIC MEDIUM DISPOSED ON THE OTHER OF SAID DISCS, ONE OF SAID DISCS HAVING A FLEXIBLE WEB AND ADAPTED TO ASSUME A POSITION IN CLOSE PROXIMITY WITH THE OTHER OF SAID DISCS AND MEANS DISPOSED AT A RADIAL POSITION IN ONE OF SAID DISCS FOR EJECTING AIR UNDER PRESSURE BETWEEN SAID DISCS WHEREBY SAID DISCS ARE HELD APART IN SPACED RELATIONSHIP.
Claim 2
Dependent Claim
87 words
IN A MAGNETIC DISC RECORDER, A FIRST DISC ADAPTED TO BE ROTATED RELATIVE TO A SECOND DISC, MAGNETIC HEADS DISPOSED IN ONE OF SAID DISCS, A MAGNETIC MEDIUM DISPOSED ON THE OTHER OF SAID DISCS, ONE OF SAID DISCS HAVING A FLEXIBLE WEB AND ADAPTED TO ASSUME A POSITION IN CLOSE PROXIMITY WITH THE OTHER OF SAID DISCS AND MEANS DISPOSED AT A RADIAL POSITION IN ONE OF SAID DISCS FOR EJECTING AIR UNDER PRESSURE BETWEEN SAID DISCS WHEREBY SAID DISCS ARE HELD APART IN SPACED RELATIONSHIP.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |