US2634164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger cleaning device
Assignee: Individual
•
Filing: 1946-11-15
•
Granted: 1953-04-07
•
Expires: 1966-11-15
Abstract
No abstract record available.
Inventors
- 👤 Robert W Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:12
CPC Classifications
F; F28; F28G; F28G9/00; F28F; F28F2230/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86911
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1337828A
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US1189752A
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US1152423A
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US1764189A
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US1598238A
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US1928090A
Cited
US2121493A
Cited
US2132093A
Cited
GB515811A
Cited
US2302513A
Cited
US2538701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |