US2728146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary heat exchanger
Assignee: Allis Chalmers Corp
•
Filing: 1952-05-21
•
Granted: 1955-12-27
•
Expires: 1972-05-21
Abstract
No abstract record available.
Inventors
- 👤 Benjamin L Cody
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:53
CPC Classifications
C; C10; C10B; C10B39/00; C10B39/10; F; F27; F27D; F27D15/00; F27D15/02; F27D15/0206; F27D15/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |