Patent US2643100A successfully refreshed from Google Patents.
US2643100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: Air Liquide SA
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Filing: 1948-12-31
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Granted: 1953-06-23
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Expires: 1968-12-31
Abstract
No abstract record available.
Inventors
- 👤 Bonnaud Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:58
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/08; F28D7/082; F28D7/0041; Y; Y10; Y10S; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/063; Y10S165/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US146733A
Cited
US1125758A
Cited
US1748140A
Cited
US1975789A
Cited
US2241186A
Cited
US2431630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |