US2821609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectifier contact structure
Assignee: Fkg Fritz Kesselring Geratebau AG
•
Filing: 1954-05-03
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Granted: 1958-01-28
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Expires: 1974-05-03
Abstract
No abstract record available.
Inventors
- 👤 Kesselring Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/50; H01H50/00; H01H50/16; H01H50/18; H01H50/30; H01H50/305; H02; H02M; H02M1/00; H02M1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2276698A
Cited
US2571780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |