US2545389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for increasing the sulfur dioxide content of the cooking acid used in the manufacture of sulfite pulp
Assignee: Kaukas Fabrik AB
•
Filing: 1946-10-26
•
Granted: 1951-03-13
•
Expires: 1966-10-26
Abstract
No abstract record available.
Inventors
- 👤 Somer Vaino Herman
- 👤 Brehmer Tor Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/04; D21C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF INCREASING THE SULFUR DIOXIDE CONTENT OF THE COOKING ACID IN CONNECTION WITH THE MANUFACTURE OF SULFITE PULB WHICH COMPRISES, DIVERTING A PORTION OF THE GAS SUPPLY, CONCENTRATING THE SULFUR DOIXIDE IN THE SAID DIVERTED PORTION OF SAID GAS SUPPLY BY MEANS OF ABSORBING IN A MIXTURE OF 2-AMINOCYMENE AND WATER, BOILING OFF THE SULFUR DIOXIDE AND RETAINING OXIDATION PRODUCTS OF SULFUR DIOXIDE IN THE ABSORPTION LIQUID, AND THEREAFTER INTRODUCING SAID CONCENTRATED SULFUR DIOXIDE TO SUPPLEMENT THE SULFUR DIOXIDE CONTENT OF THE COOKING ACID.
Claim 2
Independent Claim
86 words
A METHOD OF INCREASING THE SULFUR DIOXIDE CONTENT OF THE COOKING ACID IN CONNECTION WITH THE MANUFACTURE OF SULFITE PULB WHICH COMPRISES, DIVERTING A PORTION OF THE GAS SUPPLY, CONCENTRATING THE SULFUR DOIXIDE IN THE SAID DIVERTED PORTION OF SAID GAS SUPPLY BY MEANS OF ABSORBING IN A MIXTURE OF 2-AMINOCYMENE AND WATER, BOILING OFF THE SULFUR DIOXIDE AND RETAINING OXIDATION PRODUCTS OF SULFUR DIOXIDE IN THE ABSORPTION LIQUID, AND THEREAFTER INTRODUCING SAID CONCENTRATED SULFUR DIOXIDE TO SUPPLEMENT THE SULFUR DIOXIDE CONTENT OF THE COOKING ACID.
References Cited (Backward Citations)
US1740342A
Cited
US1893385A
Cited
US2014775A
Cited
US2009757A
Cited
US1941592A
Cited
US2047819A
Cited
US2047032A
Cited
US2186453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |