US2729607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cation exchange resin
Assignee: Bayer AG
•
Filing: 1952-03-05
•
Granted: 1956-01-03
•
Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 Haagen Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:55
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A WATER INSOLUBLE CATION EXCHANGING SOLID RESIN CONSISTING OF AN AROMATIC FORMALDEHYDE CONDENSATION PRODUCT CONTAINING CARBOXYLIC AND SULFONIC ACID GROUPS AND PHENOLIC HYDEOXY GROUPS WHICH ARE ETHERIFIED WITH A MEMBER OF THE CLASS CONSISTING OF AROMATIC AND ALIPHATIC COMPOUND, SAID RESINS BEING SUBSTANTIALLY FREE OF UNETHERIFIED PHENOLIC HYDROXYL GROUPS.
Claim 2
Dependent Claim
49 words
A WATER INSOLUBLE CATION EXCHANGING SOLID RESIN CONSISTING OF AN AROMATIC FORMALDEHYDE CONDENSATION PRODUCT CONTAINING CARBOXYLIC AND SULFONIC ACID GROUPS AND PHENOLIC HYDEOXY GROUPS WHICH ARE ETHERIFIED WITH A MEMBER OF THE CLASS CONSISTING OF AROMATIC AND ALIPHATIC COMPOUND, SAID RESINS BEING SUBSTANTIALLY FREE OF UNETHERIFIED PHENOLIC HYDROXYL GROUPS.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |