US2676980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making tanninlike materials and the resulting products
Assignee: Tanexco Inc
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Filing: 1950-01-31
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Granted: 1954-04-27
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Expires: 1970-01-31
Abstract
No abstract record available.
Inventors
- 👤 Tu Shutung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:30
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
THE METHOD OF CONVERTING VEGETABLE MATERIALS BEARING MATERIAL HAVING THE PROPERTY OF RETANNIN-LIKE MATERIAL HAVING THE PROPERTY OF REACTING WITH ANIMAL SKIN TO FORM LEATHER, WHICH COMPRISES: EXTRACTING THE VEGETABLE MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING AN AMOUNT OF ALKALI SUFFICIENT TO PRODUCE AN EXTRACT HAVING A PH OF ABOUT 6.0 TO 8.5 AND THEN ADDING AN AMOUNT OF SULFUR DIOXIDE SUFFICIENT TO REDUCE THE PH BUT NOT SUBSTANTIALLY BELOW 4 AND HEATING UNDER PRESSURE TO PRODUCE A TEMPERATURE NOT GREATER THAN ABOUT 150* C. TO PRODUCE A TANNIN-LIKE MATERIAL FROM SUCH VEGETABLE MATERIAL.
Claim 2
Independent Claim
94 words
THE METHOD OF CONVERTING VEGETABLE MATERIALS BEARING MATERIAL HAVING THE PROPERTY OF RETANNIN-LIKE MATERIAL HAVING THE PROPERTY OF REACTING WITH ANIMAL SKIN TO FORM LEATHER, WHICH COMPRISES: EXTRACTING THE VEGETABLE MATERIAL WITH AN AQUEOUS SOLUTION CONTAINING AN AMOUNT OF ALKALI SUFFICIENT TO PRODUCE AN EXTRACT HAVING A PH OF ABOUT 6.0 TO 8.5 AND THEN ADDING AN AMOUNT OF SULFUR DIOXIDE SUFFICIENT TO REDUCE THE PH BUT NOT SUBSTANTIALLY BELOW 4 AND HEATING UNDER PRESSURE TO PRODUCE A TEMPERATURE NOT GREATER THAN ABOUT 150* C. TO PRODUCE A TANNIN-LIKE MATERIAL FROM SUCH VEGETABLE MATERIAL.
Claim 3
Dependent Claim
9 words
TANNIN-LIKE MATERIAL PRODUCED BY THE METHOD OF CLAIM 1.
References Cited (Backward Citations)
GB414799A
Cited
US2505818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |