Patent US2499394A successfully refreshed from Google Patents.
US2499394A
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US
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Electric contact apparatus
Assignee: FRITZ KESSELRING GERATEBAU AG
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Filing: 1947-10-07
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Granted: 1950-03-07
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Expires: 1967-10-07
Abstract
No abstract record available.
Inventors
- 👤 Kesselring Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/26; H01; H01H; H01H9/00; H01H9/54; H01H9/56; H02M1/22; H02M1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1307517A
Cited
US1019608A
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US1221981A
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US1184223A
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US1446757A
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FR548243A
Cited
US2224934A
Cited
US2169732A
Cited
US2230228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |