Patent US3494794A successfully refreshed from Google Patents.
US3494794A
Expired / Lapsed
US
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Cleaning method
Assignee: Dow Chemical Co
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Filing: 1968-11-13
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Granted: 1970-02-10
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Expires: 1988-11-13
Abstract
No abstract record available.
Inventors
- 👤 George T Hittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:58
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5004; C11D7/5018; C11D3/00; C11D3/43; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02806; C11D7/22; C11D7/24; C11D7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2527666A
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US2653115A
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US2635063A
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US3028267A
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US3094469A
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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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |