US2618865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drum heat exchanger
Assignee: Individual
•
Filing: 1948-03-12
•
Granted: 1952-11-25
•
Expires: 1968-03-12
Abstract
No abstract record available.
Inventors
- 👤 Gerald D Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:00
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/10; F26B17/106; F26B11/00; F26B11/02; F26B11/04; F26B11/0404; F26B11/0413
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1345260A
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US1477823A
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US1503193A
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US2132972A
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US2372830A
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US2275600A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-25 | 1956-05-26 | 1956-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-25 | 1960-05-26 | 1960-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-25 | 1964-05-26 | 1964-11-25 | $7700.00 | Window Closed / Lapsed |