US2592587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light stable phenolic syntans
Assignee: Wyeth Holdings LLC
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Filing: 1949-08-09
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Granted: 1952-04-15
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Expires: 1969-08-09
Abstract
No abstract record available.
Inventors
- 👤 Daniel E Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:07
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A TANNING AGENT WHICH COMPRISES AN AQUEOUS SOLUTION OF A LIGHT-UNSTABLE PHENOLIC SYNTAN, WHICH HAS UNDERGONE SUBSTANTIALLY NO DARKENING OF ITS INITIAL COLOR, CONTAINING FROM ABOUT 1% TO ABOUT 10% BY WEIGHT OF A VEGETABLE TANNIN LIQUID EXTRACT, BASED ON THE RESIN SOLIDS CONTENT OF SAID AQUEOUS SOLUTION, SAID PHENOLIC SYNTAN BEING OF THE SULFONATED PHENOL-FORMALDEHYDE CONDENSATION PRODUCT TYPE.
Claim 2
Dependent Claim
59 words
A TANNING AGENT WHICH COMPRISES AN AQUEOUS SOLUTION OF A LIGHT-UNSTABLE PHENOLIC SYNTAN, WHICH HAS UNDERGONE SUBSTANTIALLY NO DARKENING OF ITS INITIAL COLOR, CONTAINING FROM ABOUT 1% TO ABOUT 10% BY WEIGHT OF A VEGETABLE TANNIN LIQUID EXTRACT, BASED ON THE RESIN SOLIDS CONTENT OF SAID AQUEOUS SOLUTION, SAID PHENOLIC SYNTAN BEING OF THE SULFONATED PHENOL-FORMALDEHYDE CONDENSATION PRODUCT TYPE.
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) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |