US2839638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally responsive switch structures
Assignee: Metals and Controls Corp
•
Filing: 1957-03-28
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Granted: 1958-06-17
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Expires: 1977-03-28
Abstract
No abstract record available.
Inventors
- 👤 Epstein Henry David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:20
CPC Classifications
H; H01; H01H; H01H73/00; H01H73/22; H01H73/30; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H37/54; H01H2037/5463
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2434984A
Cited
US2704312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |