US2677028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polar relay
Assignee: Western Union Telegraph Co
•
Filing: 1951-07-06
•
Granted: 1954-04-27
•
Expires: 1971-07-06
Abstract
No abstract record available.
Inventors
- 👤 William D Cannon
- 👤 Rystedt Theede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:09
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/22; H01H51/2272; H01H51/2281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US649102A
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US1177988A
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US1716357A
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US1534753A
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US1606164A
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FR594043A
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GB316675A
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US1901443A
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US2302755A
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US2346751A
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US2436224A
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US2454973A
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US2515771A
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US2483658A
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US2562382A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |