US3449733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for use in the industrial magnetic materials art
Assignee: National Standard Co
•
Filing: 1964-04-01
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Granted: 1969-06-10
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Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Leonard G Berquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:25
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B15/00; G11B15/02; G11B15/05; G11B15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2514578A
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US2558249A
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US2989690A
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US3069570A
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US3109898A
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FR1377001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |