Patent US3525635A successfully refreshed from Google Patents.
US3525635A
Expired / Lapsed
US
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Magnetic recording media
Assignee: 3M Co
•
Filing: 1965-07-01
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Granted: 1970-08-25
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Expires: 1985-07-01
Abstract
No abstract record available.
Inventors
- 👤 Willis Dale Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:43
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; H01F10/08; H01F10/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10S428/9335; Y10S428/936; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12556; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12993; Y10T428/26; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA669064A
Cited
CA709352A
Cited
US1847860A
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US2796359A
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US3011920A
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US3150939A
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US3219471A
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US3284324A
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US3226256A
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US3216846A
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US3269854A
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US3245826A
Cited
US3353986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-24 | 1974-02-23 | 1974-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-24 | 1978-02-23 | 1978-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-24 | 1982-02-23 | 1982-08-25 | $7700.00 | Window Closed / Lapsed |