Patent US2722920A successfully refreshed from Google Patents.
US2722920A
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Boiler feed water marine and like installations
Assignee: Hick Hargreaves and Co Ltd
•
Filing: 1949-11-28
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Granted: 1955-11-08
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Expires: 1969-11-28
Abstract
No abstract record available.
Inventors
- 👤 Arrowsmith George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:20
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/08; F24D19/081; B; B01; B01D; B01D19/00; B01D19/0068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US928665A
Cited
US1972356A
Cited
US1983422A
Cited
FR860645A
Cited
GB531062A
Cited
US2339369A
Cited
GB551063A
Cited
US2371443A
Cited
GB657191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |