Patent US3512930A successfully refreshed from Google Patents.
US3512930A
Expired / Lapsed
US
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Stabilized ferromagnetic chromium dioxide
Assignee: EIDP Inc
•
Filing: 1969-05-07
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Granted: 1970-05-19
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Expires: 1989-05-07
Abstract
No abstract record available.
Inventors
- 👤 William George Bottjer
- 👤 Henry Gilbert Ingersoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70636; C; C01; C01G; C01G37/00; C01G37/02; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74; C01P2004/00; C01P2004/10; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3371043A
Cited
US3449073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |