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US2809018A
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US
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Apparatus for distributing cleaning particles over gas-swept surfaces in heat exchangers and the like
Assignee: A Ekstroms Maskinaffar AB
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Filing: 1952-11-13
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Granted: 1957-10-08
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Expires: 1972-11-13
Abstract
No abstract record available.
Inventors
- 👤 Bror O Broman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:41
CPC Classifications
F; F23; F23J; F23J3/00; F23J3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US58556A
Cited
US1045742A
Cited
US1058298A
Cited
US1916337A
Cited
GB443948A
Cited
US2116879A
Cited
CH212139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |