Patent US3375981A successfully refreshed from Google Patents.
US3375981A
Expired / Lapsed
US
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Apparatus for cleaning and inhibiting corrosion in air preheaters and the like
Assignee: Babcock and Wilcox Co
•
Filing: 1965-11-19
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Granted: 1968-04-02
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Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Julian W Keck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:23
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/026; F28G; F28G9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA504958A
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US647283A
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US888693A
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US962209A
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US1248565A
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US2029337A
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DE678901C
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US2779478A
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US3002700A
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DE1146612B
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US3085754A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |