Patent US2872278A successfully refreshed from Google Patents.
US2872278A
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Synthetic tannins from sulfomethylated yacca gum and process of tanning therewith
Assignee: United Shoe Machinery Corp
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Filing: 1955-01-03
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Granted: 1959-02-03
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Expires: 1975-01-03
Abstract
No abstract record available.
Inventors
- 👤 Robert C Putnam
- 👤 Jr Stanley I Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:42
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE HEREIN DESCRIBED TANNING AGENT OBTAINED BY REACTING IN AQUEOUS MEDIUM AN ALKALINE MIXTURE CONTAINING ONE PART, BY MOLAR PROPORTION, OF UNMODIFIELD YACCA GUM, 5.0 TO 11.2 PARTS OF FORMALDEHYDE AND 2.5 TO 5.4 PARTS CALCULATED AS SULFITE, OF AN ALKALI METAL SALT OF SULFUROUS ACID SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFITES, ALKALI METAL BISULFITES, AND ALKALI METAL METABISULFIES, THE MOLAR PROPORTION OF THE SULFITE NOT BEING IN SUBSTANTIAL EXCESS OF THAT OF THE FORMALDEHYDE, AT TEMPERATURES OF 70-110*C. UNTIL THE PRODUCT IS SOLUBLE WITHOUT PRECIPITATE IN WATER ACIDIFIED WITH SULFURIC ACID TO A PH OF ABOUT 2.5.
Claim 2
Dependent Claim
101 words
THE HEREIN DESCRIBED TANNING AGENT OBTAINED BY REACTING IN AQUEOUS MEDIUM AN ALKALINE MIXTURE CONTAINING ONE PART, BY MOLAR PROPORTION, OF UNMODIFIELD YACCA GUM, 5.0 TO 11.2 PARTS OF FORMALDEHYDE AND 2.5 TO 5.4 PARTS CALCULATED AS SULFITE, OF AN ALKALI METAL SALT OF SULFUROUS ACID SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SULFITES, ALKALI METAL BISULFITES, AND ALKALI METAL METABISULFIES, THE MOLAR PROPORTION OF THE SULFITE NOT BEING IN SUBSTANTIAL EXCESS OF THAT OF THE FORMALDEHYDE, AT TEMPERATURES OF 70-110*C. UNTIL THE PRODUCT IS SOLUBLE WITHOUT PRECIPITATE IN WATER ACIDIFIED WITH SULFURIC ACID TO A PH OF ABOUT 2.5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |