US2857346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic resin tanning agents containing alkali pretreated sulfite waste liquor and process of preparing same
Assignee: Bayer AG
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Filing: 1955-01-21
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Granted: 1958-10-21
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Expires: 1975-01-21
Abstract
No abstract record available.
Inventors
- 👤 Mauthe Gustav
- 👤 Fingado Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR PRODUCING SOLID KNEADABLE TANNING RESINS WHICH COMPRISES PRECIPITATING A MIXTURE OF (1) A MEMBER SELECTED FROM THE GROUP CONSISTING OF A CONDENSATION PRODUCT OF (A) AN AROMATIC SULFONIC ACID WITH (B) AN AROMATIC HYDROXY COMPOUND AND (C) AN ALDEHYDEAND A CONDENSATION PRODUCT OF (A) AN AROMATIC COMPOUND CONTAINING AT LEAST ONE SULFO-METHYL GROUP WITH (B) AN AROMATIC HYDROXY COMPOUND AND (C) AN ALDEHYDE, AND (2) AN ALKALI-PRETREATED SULFITE WASTE LIQUOR BY MEANS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, HYDROCHLORIC ACID, AN ALKALI METAL SALT OF SAILD ACIDS AND AN AMMONIUM SALT OF SAID ACIDS.
Claim 2
Dependent Claim
102 words
A PROCESS FOR PRODUCING SOLID KNEADABLE TANNING RESINS WHICH COMPRISES PRECIPITATING A MIXTURE OF (1) A MEMBER SELECTED FROM THE GROUP CONSISTING OF A CONDENSATION PRODUCT OF (A) AN AROMATIC SULFONIC ACID WITH (B) AN AROMATIC HYDROXY COMPOUND AND (C) AN ALDEHYDEAND A CONDENSATION PRODUCT OF (A) AN AROMATIC COMPOUND CONTAINING AT LEAST ONE SULFO-METHYL GROUP WITH (B) AN AROMATIC HYDROXY COMPOUND AND (C) AN ALDEHYDE, AND (2) AN ALKALI-PRETREATED SULFITE WASTE LIQUOR BY MEANS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, HYDROCHLORIC ACID, AN ALKALI METAL SALT OF SAILD ACIDS AND AN AMMONIUM SALT OF SAID ACIDS.
References Cited (Backward Citations)
US2184622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |