US2804283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterflow condenser
Assignee: Individual
•
Filing: 1955-05-16
•
Granted: 1957-08-27
•
Expires: 1975-05-16
Abstract
No abstract record available.
Inventors
- 👤 Stanley J Ruszkowski
- 👤 Frank E Pietruszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:34
CPC Classifications
F; F28; F28B; F28B1/00; F28B1/02; F28D; F28D7/00; F28D7/02; F28D7/026; F28F; F28F9/00; F28F9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1734136A
Cited
US1943484A
Cited
US1967136A
Cited
US2166808A
Cited
US2267695A
Cited
US2413360A
Cited
US2358274A
Cited
US2643863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |