US3428928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer including boron nitride insulation
Assignee: Ovitron Corp
•
Filing: 1966-11-18
•
Granted: 1969-02-18
•
Expires: 1986-11-18
Abstract
No abstract record available.
Inventors
- 👤 Robert Q Maines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US981690A
Cited
GB357510A
Cited
US1935885A
Cited
GB648697A
Cited
US2316370A
Cited
US2354159A
Cited
US2770785A
Cited
GB812162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |