US3143673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Homopolar generator
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1960-08-08
•
Granted: 1964-08-04
•
Expires: 1980-08-08
Abstract
No abstract record available.
Inventors
- 👤 Coleman Du P Donaldson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:38
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/08; H02K44/12; H02K44/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1443091A
Cited
US1196511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |