US3542589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media having high abrasion resistance
Assignee: BASF SE
•
Filing: 1968-03-27
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Granted: 1970-11-24
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Expires: 1988-03-27
Abstract
No abstract record available.
Inventors
- 👤 Job-Werner Hartmann
- 👤 Georg Schnell
- 👤 Erwin Schmidt
- 👤 Friedrich Gress
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31765; Y10T428/31786
Claims Analysis
Total Claims: 0
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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) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |