Patent US2798693A successfully refreshed from Google Patents.
US2798693A
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US
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Rotary heat exchangers
Assignee: Individual
•
Filing: 1952-09-11
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Granted: 1957-07-09
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Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 Bojner Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:15
CPC Classifications
F; F26; F26B; F26B23/00; F26B23/10; F27; F27D; F27D15/00; F27D15/02; F27D15/0206; F27D15/028; F28; F28D; F28D11/00; F28D11/02; F28D11/04; F27D9/00; F27D2009/007; F27D2009/0072; F27D2009/0078; Y; Y10; Y10S; Y10S165/00; Y10S165/135; Y10S165/139; Y10S165/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE110394C
Cited
GB189916381A
Cited
US1831049A
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US2037490A
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US2311984A
Cited
US2354567A
Cited
US2373382A
Cited
US2496301A
Cited
US2639898A
Cited
US2715517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |