Patent US2444880A successfully refreshed from Google Patents.
US2444880A
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Electrical seal
Assignee: Sprague Electric Co
•
Filing: 1943-12-23
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Granted: 1948-07-06
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Expires: 1963-12-23
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 Paul H Netherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/224; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49169
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1693365A
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GB284897A
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GB329215A
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US2017204A
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US2197357A
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US2229291A
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US2199803A
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US2256897A
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US2325105A
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US2328825A
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US2365926A
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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) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |