US2597809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of syntans
Assignee: UNITED STATES LEATHER Co
•
Filing: 1948-09-08
•
Granted: 1952-05-20
•
Expires: 1968-09-08
Abstract
No abstract record available.
Inventors
- 👤 Miglarese John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:13
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS OF PREPARING A WATER-SOLUBLE TANNING MATERIAL WHICH COMPRISES DISSOLVING WATER-INSOLUBLE SODA LIGNIN IN A PHENOL IN PROPORTIONS FROM ABOUT 1 PART OF SODA LIGNIN TO 2 PARTS OF PHENOL TO ABOUT 5 PARTS OF SODA LIGNIN TO 1 PART OF PHENOL, SULFONATING THE SAME BY THE GRADUAL AND PROGRESSIVE ADDITION OF CONCENTRATED SULFURIC ACID WITH STIRRING AT A TEMPERATURE AROUND 50 TO 60* C. WITH SUBSEQUENT INCREASE IN TEMPERATURE TO AROUND 95*C. TO FORM A WATER SOLUBLE PRODUCT, AND REDUCING THE ACIDITY OF THE SOLUTION TO A PH OF AROUND 3.5.
Claim 2
Dependent Claim
93 words
THE PROCESS OF PREPARING A WATER-SOLUBLE TANNING MATERIAL WHICH COMPRISES DISSOLVING WATER-INSOLUBLE SODA LIGNIN IN A PHENOL IN PROPORTIONS FROM ABOUT 1 PART OF SODA LIGNIN TO 2 PARTS OF PHENOL TO ABOUT 5 PARTS OF SODA LIGNIN TO 1 PART OF PHENOL, SULFONATING THE SAME BY THE GRADUAL AND PROGRESSIVE ADDITION OF CONCENTRATED SULFURIC ACID WITH STIRRING AT A TEMPERATURE AROUND 50 TO 60* C. WITH SUBSEQUENT INCREASE IN TEMPERATURE TO AROUND 95*C. TO FORM A WATER SOLUBLE PRODUCT, AND REDUCING THE ACIDITY OF THE SOLUTION TO A PH OF AROUND 3.5.
References Cited (Backward Citations)
US2040212A
Cited
US1430477A
Cited
US1539517A
Cited
US2099717A
Cited
US2092622A
Cited
US2122124A
Cited
US2148893A
Cited
US2184622A
Cited
US2191737A
Cited
US2186509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |