Patent US2692867A successfully refreshed from Google Patents.
US2692867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cation-exchanging synthetic resins
Assignee: Bayer AG
•
Filing: 1951-02-28
•
Granted: 1954-10-26
•
Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 Passing Heinrich
- 👤 Bauer Rudolf
- 👤 Delfs Detlef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:23
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PRODUCTION OF CATION EXCHANGE RESIN WHICH CONSISTS ESSENTIALLY OF CONDENSING IN THE FOLLOWING PROPORTIONS, AND IN AN ACID MEDIUM UNTIL A GEL IS FORMED, (A) FORMMALDEHYDE, (B) 1 MOL OF A FORMALDEHYDE-REACTIVE NAPHTHALENE MONOSULFONIC ACID OF THE GROUP CONSISTING OF A-NAPHTHALENE MONOSULFONIC ACID, BNAPHTHALENE MONOSULFONIC ACID, ALKYL SUBSTITUTION PRODUCTS THEREOF AND WATER SOLUBLE PREFORMED ALDEHYDE CONDENSATION PRODUCTS THEREOF (C) 0.5 TO 3 MOLS OF A MEMBER OF THE CLASS CONSISTING OF PHENOLS AND ALKYL SUBSTITUTION PRODUCTS THEREOF REACTIVE WITH FORMALDEHYDE TO FORM GELS, SAID PHENOLS HAVING THE FORMULA
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PRODUCTION OF CATION EXCHANGE RESIN WHICH CONSISTS ESSENTIALLY OF CONDENSING IN THE FOLLOWING PROPORTIONS, AND IN AN ACID MEDIUM UNTIL A GEL IS FORMED, (A) FORMMALDEHYDE, (B) 1 MOL OF A FORMALDEHYDE-REACTIVE NAPHTHALENE MONOSULFONIC ACID OF THE GROUP CONSISTING OF A-NAPHTHALENE MONOSULFONIC ACID, BNAPHTHALENE MONOSULFONIC ACID, ALKYL SUBSTITUTION PRODUCTS THEREOF AND WATER SOLUBLE PREFORMED ALDEHYDE CONDENSATION PRODUCTS THEREOF (C) 0.5 TO 3 MOLS OF A MEMBER OF THE CLASS CONSISTING OF PHENOLS AND ALKYL SUBSTITUTION PRODUCTS THEREOF REACTIVE WITH FORMALDEHYDE TO FORM GELS, SAID PHENOLS HAVING 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) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |