US2719075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alkali metal sulfite liquors
Assignee: Honeywell International Inc
•
Filing: 1952-01-21
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Granted: 1955-09-27
•
Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 Walter S Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE PROCESS OF PURIFYING AN ALKALI METAL SULFITE LIQUOR CONTAINING CALCIUM SULFITE AND OTHER TURBIDITY-PRODUCING IMPURITIES WHICH COMPRISES INCORPORATING IN THE LIQUOR NOT MORE THAN ABOUT 0.04% BY WEIGHT COPPER (BASE ON THE SULFITE LIQUOR) AS A WATER-SOLUBLE COPPER
Claim 2
Dependent Claim
39 words
THE PROCESS OF PURIFYING AN ALKALI METAL SULFITE LIQUOR CONTAINING CALCIUM SULFITE AND OTHER TURBIDITY-PRODUCING IMPURITIES WHICH COMPRISES INCORPORATING IN THE LIQUOR NOT MORE THAN ABOUT 0.04% BY WEIGHT COPPER (BASE ON THE SULFITE LIQUOR) AS A WATER-SOLUBLE COPPER
References Cited (Backward Citations)
US1937944A
Cited
FR884791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-26 | 1959-03-28 | 1959-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-26 | 1963-03-28 | 1963-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-26 | 1967-03-28 | 1967-09-27 | $7700.00 | Window Closed / Lapsed |