Patent US2807688A successfully refreshed from Google Patents.
US2807688A
Expired / Lapsed
US
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Electromagnetic relay
Assignee: BULOVA RES AND DEV LAB Inc
•
Filing: 1954-11-26
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Granted: 1957-09-24
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Expires: 1974-11-26
Abstract
No abstract record available.
Inventors
- 👤 Fischer Franz
- 👤 Punzmann Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:19
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US780678A
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US1004005A
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US1239114A
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US1231271A
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US1261777A
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US1215423A
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US1504227A
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US1839629A
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US1981681A
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US2489185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |