Patent US2789187A successfully refreshed from Google Patents.
US2789187A
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US
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Electrical contact devices, particularly for high switching frequency and high current loading
Assignee: Siemens and Halske AG
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Filing: 1954-11-19
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Granted: 1957-04-16
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Expires: 1974-11-19
Abstract
No abstract record available.
Inventors
- 👤 Romer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:32
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; C; C22; C22C; C22C5/00; C22C5/02; C22C5/04; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |