US2801824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning heat exchanger
Assignee: Individual
•
Filing: 1953-02-02
•
Granted: 1957-08-06
•
Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Taprogge Josef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:00
CPC Classifications
F; F28; F28G; F28G1/00; F28G1/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US243744A
Cited
US784170A
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US1069408A
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US1592149A
Cited
US1795348A
Cited
US1951252A
Cited
US2089702A
Cited
US2190382A
Cited
US2556080A
Cited
US2670723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |