US3421933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinel ferrite epitaxial composite
Assignee: Boeing North American Inc
•
Filing: 1966-12-14
•
Granted: 1969-01-14
•
Expires: 1986-12-14
Abstract
No abstract record available.
Inventors
- 👤 George R Pulliam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:31
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; H01F10/08; H01F10/10; H01F10/18; H01F10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2848310A
Cited
US2842468A
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US2919207A
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US3102099A
Cited
US3094395A
Cited
US3047438A
Cited
US3332796A
Cited
US3312571A
Cited
US3301213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |