US2566441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic record medium and method of making the same
Assignee: IIT Research Institute
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Filing: 1946-04-29
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Granted: 1951-09-04
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Expires: 1966-04-29
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; Y; Y10; Y10S; Y10S425/00; Y10S425/033; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/294; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
THE METHOD OF MAKING A MAGNETIC RECORD MEMBER WHICH COMPRISES EXTRUDING A SOLID FILAMENTARY CORE OF HIGH POLYMERIC RESINOUS MATERIAL, PROVIDING A SHEAT OF HIGH POLYMERIC RESINOUS MATERIAL CONTAINING FINELY DIVIDED PARTICLES OF RELATIVELY HIGH COERCIVE FORCE COMPLETELY ABOUT SAID CORE, AND SIMULTANEOUSLY STRETCHING SAID SHEAT AND CORE WHILE DRAWING THE MEMBER THROUGH A DIE TO REMOVE SURFACE IRREGULARITIES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |