US2819890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counter-current recirculating device for the exchange of heat between a gas and a finely granulated material
Assignee: Individual
•
Filing: 1956-06-11
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Granted: 1958-01-14
•
Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Rosa Josef
- 👤 Petr Vlastimil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/10; F26B17/101; F26B17/104; B; B01; B01J; B01J8/00; B01J8/18; C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; C04B2/00; C04B2/10; C04B7/00; C04B7/36; C04B7/43; C22; C22B; C22B1/00; C22B1/02; C22B1/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US533929A
Cited
US1766030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |