US2716098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water soluble condensation products with a tanning action
Assignee: Novartis AG
•
Filing: 1952-02-07
•
Granted: 1955-08-23
•
Expires: 1972-02-07
Abstract
No abstract record available.
Inventors
- 👤 Biedermann Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A TANNING AGENT OBTAINED BY REACTING FORMALDEHYDE IN AN AQUEOUS ALKALINE MEDIUM AT A RAISED TEMPERATURE WITH A MIXTURE OF A HYDROXYPOLYARYLSULPHONE SULPHONIC ACID CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
28 words
A TANNING AGENT OBTAINED BY REACTING FORMALDEHYDE IN AN AQUEOUS ALKALINE MEDIUM AT A RAISED TEMPERATURE WITH A MIXTURE OF A HYDROXYPOLYARYLSULPHONE SULPHONIC ACID CORRESPONDING TO THE FORMULA
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) | 1958-08-22 | 1959-02-21 | 1959-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-08-22 | 1963-02-21 | 1963-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-08-22 | 1967-02-21 | 1967-08-23 | $7700.00 | Window Closed / Lapsed |