US2529688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric fluid heater
Assignee: Individual
•
Filing: 1947-04-26
•
Granted: 1950-11-14
•
Expires: 1967-04-26
Abstract
No abstract record available.
Inventors
- 👤 Edward L Grupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:27
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US754451A
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US1689521A
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US1941584A
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US1916064A
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US1990790A
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US2306921A
Cited
US2257841A
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US2325722A
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US2312677A
Cited
US2428445A
Cited
US2429112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |