US2991979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-liquid heat exchanger
Assignee: Individual
•
Filing: 1957-11-15
•
Granted: 1961-07-11
•
Expires: 1977-11-15
Abstract
No abstract record available.
Inventors
- 👤 Roland L Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:20
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/156; Y10S165/159
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1656790A
Cited
US2037490A
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US2249301A
Cited
US2104558A
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US2311984A
Cited
US2797899A
Cited
US2902774A
Cited
US2919904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |