Patent US2091898A successfully refreshed from Google Patents.
US2091898A
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Crystallization
Assignee: Dorr Co
•
Filing: 1933-07-07
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Granted: 1937-08-31
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Expires: 1953-07-07
Abstract
No abstract record available.
Inventors
- 👤 William C Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
B; B01; B01D; B01D1/00; B01D1/04; B01D21/00; B01D21/02; B01D21/04; B01D21/06; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2488; B01D9/00; B01D9/0018; B01D9/0022; B01D9/0036; B01D9/0063; Y; Y10; Y10S; Y10S159/00; Y10S159/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-08-30 | 1941-03-01 | 1941-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-30 | 1945-03-01 | 1945-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-30 | 1949-03-01 | 1949-08-31 | $7700.00 | Window Closed / Lapsed |