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Patent US1809304A successfully refreshed from Google Patents.
US1809304A
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Thermal relay
Assignee: Westinghouse Electric Corp
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Filing: 1929-03-06
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Granted: 1931-06-09
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Expires: 1949-03-06
Abstract
No abstract record available.
Inventors
- 👤 Howard D Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01J19/00; H01J19/28; H01J19/32; H01J19/34; H01H2037/526; H01H2037/528; H01H2037/5463; H01J2893/00; H01J2893/0001; H01J2893/0002; H01J2893/0003; H01J2893/0004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1934-06-08 | 1934-12-08 | 1935-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-06-08 | 1938-12-08 | 1939-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-06-08 | 1942-12-08 | 1943-06-09 | $7700.00 | Window Closed / Lapsed |