Patent US3522093A successfully refreshed from Google Patents.
US3522093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes of cleaning and passivating reactor equipment
Assignee: MAINTECH INTERNATIONAL Inc A CORP OF TX
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Filing: 1967-02-27
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Granted: 1970-07-28
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Expires: 1987-02-27
Abstract
No abstract record available.
Inventors
- 👤 Wilfrid A Woolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:29
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C23; C23G; C23G1/00; C11D2111/00; C11D2111/10; C11D2111/14; C11D2111/20; C11D2111/40; C11D2111/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2326837A
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US2428364A
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US3003896A
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US3132975A
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US3066050A
Cited
US3072502A
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US3290174A
Cited
US3166444A
Cited
US3385735A
Cited
US3460989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |