US3150939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density record carrier
Assignee: International Business Machines Corp
•
Filing: 1961-07-17
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Granted: 1964-09-29
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Expires: 1981-07-17
Abstract
No abstract record available.
Inventors
- 👤 John W Wenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:32
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/32; C23C18/34; C23C18/36; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/14; H01F10/26; H01F10/28; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/934; Y10S428/935; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12986; Y10T428/24; Y10T428/24355; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A RECORD CARRIER HAVING A MAGNETIC RECORDING MEDIUM ON THE SURFACE THEREOF FOR THE STORAGE OF INTELLIGENCE AT HIGH DENSITY , THE COMBINATION OF: A CARRIER, SAID CARRIER BEING A DIELECTRIC RESIN SHEET FORMED FROM THE POLYMERIC CONDENSATION PRODUCT OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL, A THIN FILM OF METAL SUPERIMPOSED ON SAID CARRIER SURFACE, SAID METAL PROVIDING NUCLEI FOR BONDING A MAGNETIZABLE METAL THIN FILM TO THE CARRIER SURFACE WITH A FIRM FUSED METAL-TO-RESIN BOND AND SAID METAL HAVING A SURFACE WITH A ROUGHNESS BETWEEN 2 TO 4 MICROINCHES PEAK TO PEAK; AND A MAGNETIC RECORDING MEDIUM SUPERIMPOSED OVER AND BONDED TO SAID THIN FILM OF METAL, SAID MAGNETIC RECORDING MEDIUM BEING A METAL FILM SELECTED FROM THE GROUP CONSISTING OF COBALT AND COBALT BASE ALLOYS HAVING A COERCIVITY OF AT LEAST 375 OERSTEDS, A RESIDUAL INDUCTION IN THE RANGE BETWEEN 6,000-14,500 GAUSS AND RECORDING SURFACE WITH A ROUGHNESS IN THE RANGE BETWEEN 2 TO 4 MICROINCHES PEAK TO PEAK.
Claim 2
Dependent Claim
162 words
IN A RECORD CARRIER HAVING A MAGNETIC RECORDING MEDIUM ON THE SURFACE THEREOF FOR THE STORAGE OF INTELLIGENCE AT HIGH DENSITY , THE COMBINATION OF: A CARRIER, SAID CARRIER BEING A DIELECTRIC RESIN SHEET FORMED FROM THE POLYMERIC CONDENSATION PRODUCT OF TEREPHTHALIC ACID AND ETHYLENE GLYCOL, A THIN FILM OF METAL SUPERIMPOSED ON SAID CARRIER SURFACE, SAID METAL PROVIDING NUCLEI FOR BONDING A MAGNETIZABLE METAL THIN FILM TO THE CARRIER SURFACE WITH A FIRM FUSED METAL-TO-RESIN BOND AND SAID METAL HAVING A SURFACE WITH A ROUGHNESS BETWEEN 2 TO 4 MICROINCHES PEAK TO PEAK; AND A MAGNETIC RECORDING MEDIUM SUPERIMPOSED OVER AND BONDED TO SAID THIN FILM OF METAL, SAID MAGNETIC RECORDING MEDIUM BEING A METAL FILM SELECTED FROM THE GROUP CONSISTING OF COBALT AND COBALT BASE ALLOYS HAVING A COERCIVITY OF AT LEAST 375 OERSTEDS, A RESIDUAL INDUCTION IN THE RANGE BETWEEN 6,000-14,500 GAUSS AND RECORDING SURFACE WITH A ROUGHNESS IN THE RANGE BETWEEN 2 TO 4 MICROINCHES PEAK TO PEAK.
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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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |