US2890095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of retanning leather with condensation products of phenols, amines, and formaldehyde
Assignee: Bayer AG
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Filing: 1954-03-16
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Granted: 1959-06-09
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Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Meister Martin
- 👤 Mauthe Gustav
- 👤 Faber Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:59
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A RETAINING PROCESS WHICH COMPRISING RETAINING PRETANNED LEATHER WITH AN AQUEOUS SOLUTION OF AN ACIDSOLUBLE,, CATIONIC RETAINING AGENT OBTAINED ESSENTIALLY FROM A CONDENSATION IN AN ALKALINE MEDIUM AT A TEMPERATURE UP TO ABOUT 100*C. OF (1) A MEMBER OF THE GROUP CONSISTING OF PHENOL, CHLOROPHENOL, CRESOL, 4,4''DIHYDROXYDIPHENYL - DIMETHYLMETHANE, AND CYCLOHEXYL PHENOL (2) AN AMINAE HAVING THE FORMULA HNR1R2 WHEREIN R1 IS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, LOWER LKYL, AND HYDROXY-LOWER ALKYL, AND IS A MEMBER OF THE GROUP CONSISTING OF LOWER ALKYL AND MORPHOLINO AND (3) FORMADEHYDE, 1-2 MOLS OF THE AMINE AND FROM 1,5-2MOLS OF FORMALDEHYDE BEING EMPOLYED PER ONE MOLE OF THE PHENOLIC COMPOUND, SAID RETAINING STARTING AT A PH WITHIN THE RANGE OF ABOUT 3.5 TO 4.5 AND FINISHING AT A PH WITHIN THE RANGE OF ABOUT 5 TO 7.
Claim 2
Dependent Claim
137 words
A RETAINING PROCESS WHICH COMPRISING RETAINING PRETANNED LEATHER WITH AN AQUEOUS SOLUTION OF AN ACIDSOLUBLE,, CATIONIC RETAINING AGENT OBTAINED ESSENTIALLY FROM A CONDENSATION IN AN ALKALINE MEDIUM AT A TEMPERATURE UP TO ABOUT 100*C. OF (1) A MEMBER OF THE GROUP CONSISTING OF PHENOL, CHLOROPHENOL, CRESOL, 4,4''DIHYDROXYDIPHENYL - DIMETHYLMETHANE, AND CYCLOHEXYL PHENOL (2) AN AMINAE HAVING THE FORMULA HNR1R2 WHEREIN R1 IS A MEMBER OF THE GROUP CONSISTING OF HYDROGEN, LOWER LKYL, AND HYDROXY-LOWER ALKYL, AND IS A MEMBER OF THE GROUP CONSISTING OF LOWER ALKYL AND MORPHOLINO AND (3) FORMADEHYDE, 1-2 MOLS OF THE AMINE AND FROM 1,5-2MOLS OF FORMALDEHYDE BEING EMPOLYED PER ONE MOLE OF THE PHENOLIC COMPOUND, SAID RETAINING STARTING AT A PH WITHIN THE RANGE OF ABOUT 3.5 TO 4.5 AND FINISHING AT A PH WITHIN THE RANGE OF ABOUT 5 TO 7.
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) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |