US3734772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording media
Assignee: BASF SE
•
Filing: 1971-01-13
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Granted: 1973-05-22
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Expires: 1991-01-13
Abstract
Abstract MAGNETIC RECORDING MEDIA IN TAPE FORM HAVING ON THE BACK OF THE SUBSTRATE A PATTERN OF RAISED DOTS WITH A HIGH COEFFICIENT OF FRICTION WHICH IMPROVE THE WINDING PROPERTIES.
Inventors
- 👤 G Schnell
- 👤 H Stritzinger
- 👤 G Vaeth
- 👤 W Grau
- 👤 F Hammon
- 👤 M Hopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/74; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |