US3411879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aqueous hydrochloric acid
Assignee: Dow Chemical Co
•
Filing: 1965-09-17
•
Granted: 1968-11-19
•
Expires: 1985-09-17
Abstract
No abstract record available.
Inventors
- 👤 Robert E Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:40
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/01; C01B7/07; C01B7/0706; C01B7/0718
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2526776A
Cited
US2526777A
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US2920941A
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US2919174A
Cited
US3057681A
Cited
US3074779A
Cited
GB960261A
Cited
US3140916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |