US3359549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random access magnetic disc file assembly
Assignee: North American Aviation Corp
•
Filing: 1964-09-08
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Granted: 1967-12-19
•
Expires: 1984-09-08
Abstract
No abstract record available.
Inventors
- 👤 William A Farrand
- 👤 Norman E Marcum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:34
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B17/00; G11B17/02; G11B17/038; G11B23/00; G11B23/02; G11B23/021; G11B23/03; G11B23/032; G11B23/0323; G11B25/00; G11B25/04; G11B25/043; G11B5/54; G11B5/55; G11B5/5521; G11B5/74; G11B5/82; G11B5/825
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A RECORD DISC COMPRISING A RADIALLY PRE-TENSIONED ANNULAR DISC HELD TAUT AT ITS PERIPHERY TO FORM A FLAT PRE-STRESSED RECORD SURFACE, MEANS PASSING THROUGH THE CENTER OF SAID ANNULAR DISC FOR SUPPORTING AT LEAST ONE TRANSDUCER CLOSE TO SAID RECORD SURFACE, INCLUDING MEANS FOR VARYING THE POSITION OF SAID TRANSDUCER RADIALLY ALONG SAID SURFACE, AND MEANS FOR ROTATING SAID DISC.
Claim 2
Dependent Claim
60 words
A RECORD DISC COMPRISING A RADIALLY PRE-TENSIONED ANNULAR DISC HELD TAUT AT ITS PERIPHERY TO FORM A FLAT PRE-STRESSED RECORD SURFACE, MEANS PASSING THROUGH THE CENTER OF SAID ANNULAR DISC FOR SUPPORTING AT LEAST ONE TRANSDUCER CLOSE TO SAID RECORD SURFACE, INCLUDING MEANS FOR VARYING THE POSITION OF SAID TRANSDUCER RADIALLY ALONG SAID SURFACE, AND MEANS FOR ROTATING SAID DISC.
References Cited (Backward Citations)
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Cited
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Cited
US3229269A
Cited
US3209079A
Cited
US3336583A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |