Patent US3574684A successfully refreshed from Google Patents.
US3574684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane magnetic coating composition
Assignee: Memorex Corp
•
Filing: 1965-05-26
•
Granted: 1971-04-13
•
Expires: 1985-05-26
Abstract
Abstract A POLYURETHANE MAGNETIC COATING COMPOSITION FOR RECORDING TAPE COMPRISING A MAGNETIC PIGMENT IN A THERMOSETTING BINDER MADE FROM A LOW MOLECULAR WEIGHT DIOL, A HIGH MOLECULAR WEIGHT POLYESTER DIOL HAVING A MOLECULAR WEIGHT BETWEEN 10,000 AND 30,000 AND A TRIISOCYANATE.
Inventors
- 👤 Louis M Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/702; G11B5/7021; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; Y; Y10; Y10S; Y10S264/00; Y10S264/17; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |