US2637540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid contact apparatus
Assignee: Research Products Corp
•
Filing: 1949-05-05
•
Granted: 1953-05-05
•
Expires: 1969-05-05
Abstract
No abstract record available.
Inventors
- 👤 Carl B Rowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:27
CPC Classifications
F; F24; F24F; F24F6/00; F24F6/02; F24F6/04; Y; Y10; Y10S; Y10S261/00; Y10S261/41; Y10S261/44; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US754053A
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US1841536A
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US2182501A
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FR869527A
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US2366906A
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US2408158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |