US3497739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homopolar electrical machines
Assignee: JOHN THOMPSON (PIPEWORK AND ORDNANCE DIVISION) Ltd
•
Filing: 1967-12-26
•
Granted: 1970-02-24
•
Expires: 1987-12-26
Abstract
No abstract record available.
Inventors
- 👤 Anthony D Appleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
H; H02; H02K; H02K31/00; H02K31/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE290592C
Cited
US1223094A
Cited
US1255838A
Cited
US2011349A
Cited
US2261684A
Cited
US3187212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |