Patent US2592783A successfully refreshed from Google Patents.
US2592783A
Expired / Lapsed
US
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Rotary heat exchanger
Assignee: Individual
•
Filing: 1946-04-17
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Granted: 1952-04-15
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Expires: 1966-04-17
Abstract
No abstract record available.
Inventors
- 👤 Aspegren Olof Erik August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:23
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/18; C; C03; C03B; C03B1/00; C03B1/02; F26; F26B; F26B3/00; F26B3/18; F26B3/20; F26B3/205; Y; Y10; Y10S; Y10S165/00; Y10S165/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |