US3614831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a hard-surface rotor containing magnetic transducers
Assignee: Unisys Corp
•
Filing: 1969-09-12
•
Granted: 1971-10-26
•
Expires: 1989-09-12
Abstract
Abstract A HARD-SURFACE ROTOR IN A ROTATING-HEAD MAGNETIC MEMORY SYSTEM FOR MAINTAINING THE UNIFORM PROFILE OF FLEXIBLE MAGNETIC RECORD MEMBERS USED IN THE MAGNETIC MEMORY SYSTEM AND FOR RESISTING DAMAGE TO THE ROTOR RESULTING FROM ACCIDENTAL CONTACTING OF THE FLEXIBLE MAGNETIC RECORD MEMBER WITH THE ROTOR SURFACE IS DESCRIBED. A METHOD FOR PROVIDING A HARD-SURFACE COATING OVER AN ENTIRE ROTOR PERIPHERAL SURFACE, WITH ONLY THE MAGNETIC TRANSDUCER POLE PIECES EXPOSED, IS ALSO DESCRIBED.
Inventors
- 👤 Matthias J Grundtner
- 👤 George E Melink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:09
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/127; G11B5/187; G11B5/255; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49027; Y10T29/4903; Y10T29/49032; Y10T29/49036; Y10T29/49041; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |