US2766968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for selectively cleaning heat exchange tubes
Assignee: Foster Wheeler Inc
•
Filing: 1952-08-28
•
Granted: 1956-10-16
•
Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 Blizard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:12
CPC Classifications
F; F23; F23J; F23J3/00; F23J3/02; F23M; F23M20/00; Y; Y10; Y10S; Y10S159/00; Y10S159/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1262428A
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US1641999A
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US1688700A
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US1785334A
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US1903650A
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US1970127A
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US2576843A
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US2538701A
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US2594471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |