US3303485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc with air bearing which spirals radially outward
Assignee: Ampex Corp
•
Filing: 1963-03-18
•
Granted: 1967-02-07
•
Expires: 1983-03-18
Abstract
No abstract record available.
Inventors
- 👤 Lester H Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:39
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B17/00; G11B17/32; G11B5/488; G11B5/4886
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A FLEXIBLE DISK MAGNETIC MEMORY SYSTEM COMPRISING: A RELATIVELY THIN FLEXIBLE DISK HAVING MAGNETIC RECORDING SURFACES ON BOTH SIDES THEREOF; A PAIR OF BACKING PLATES, EACH OF SAID PLATES BEING ALIGNED ADJACENT A DIFFERENT SIDE OF SAID DISK AND PROVIDING A PLANAR SURFACE IN CONTROLLED PARALLELISM THEREWITH; A PLURALITY OF MAGNETIC TRANSDUCER DISPOSED IN EACH PLATE; MEANS FOR ROTATING SAID DISK RELATIVE TO SAID PLATES ABOUT THE CENTRAL AXIS OF SAID DISK; AND
Claim 2
Dependent Claim
73 words
A FLEXIBLE DISK MAGNETIC MEMORY SYSTEM COMPRISING: A RELATIVELY THIN FLEXIBLE DISK HAVING MAGNETIC RECORDING SURFACES ON BOTH SIDES THEREOF; A PAIR OF BACKING PLATES, EACH OF SAID PLATES BEING ALIGNED ADJACENT A DIFFERENT SIDE OF SAID DISK AND PROVIDING A PLANAR SURFACE IN CONTROLLED PARALLELISM THEREWITH; A PLURALITY OF MAGNETIC TRANSDUCER DISPOSED IN EACH PLATE; MEANS FOR ROTATING SAID DISK RELATIVE TO SAID PLATES ABOUT THE CENTRAL AXIS OF SAID DISK; AND
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |