Patent US2525601A successfully refreshed from Google Patents.
US2525601A
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Magnetic impulse record member
Assignee: Indiana Steel Products Co
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Filing: 1947-04-16
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Granted: 1950-10-10
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Expires: 1967-04-16
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678; G11B5/70684; G11B5/70689; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A MAGNETIC IMPULSE RECORD MEMBER COMPRISING A PAPER TAPE BASE HAVING AN ADHERENT RESINOUS COATING OF A RESIN AND FINELY DIVIDED FERROMAGNETIC MATERIAL CONSISTING OF AN OXYFERRITE MATRIX WITH WELL-DISPERSED, SUBMICROSCOPIC PARTICLES OF FE3O4, THE EFFECTIVE OXYGEN IN THE DISPERSED FE3O4 BEING NOT MORE THAN ABOUT 5% BY WEIGHT AND THE TOTAL OXYGEN (O2) BEING NOT MORE THAN 11% BY WEIGHT OF THE FERROMAGNETIC MATERIAL, THE COERCIVE FORCE VALUE OF SAID MEMBER BEING GREATER THAN 300 OERSTEDS.
Claim 2
Dependent Claim
77 words
A MAGNETIC IMPULSE RECORD MEMBER COMPRISING A PAPER TAPE BASE HAVING AN ADHERENT RESINOUS COATING OF A RESIN AND FINELY DIVIDED FERROMAGNETIC MATERIAL CONSISTING OF AN OXYFERRITE MATRIX WITH WELL-DISPERSED, SUBMICROSCOPIC PARTICLES OF FE3O4, THE EFFECTIVE OXYGEN IN THE DISPERSED FE3O4 BEING NOT MORE THAN ABOUT 5% BY WEIGHT AND THE TOTAL OXYGEN (O2) BEING NOT MORE THAN 11% BY WEIGHT OF THE FERROMAGNETIC MATERIAL, THE COERCIVE FORCE VALUE OF SAID MEMBER BEING GREATER THAN 300 OERSTEDS.
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |