US3516860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a magnetic recording medium
Assignee: Singer Co
•
Filing: 1967-08-31
•
Granted: 1970-06-23
•
Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 Charles A Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:57
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; G11B5/84; G11B5/85
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3161946A
Cited
US2853402A
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US2900282A
Cited
US3192892A
Cited
US3109749A
Cited
US3375091A
Cited
US3378394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |