US2495673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tritube heating element
Assignee: Salt Water Control Inc
•
Filing: 1945-04-09
•
Granted: 1950-01-24
•
Expires: 1965-04-09
Abstract
No abstract record available.
Inventors
- 👤 Ransome W Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:04
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US394689A
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US900873A
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US1041188A
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US1512389A
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US2181685A
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US2122310A
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US2211171A
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US2185594A
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US2228471A
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US2366302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |