US2689227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Penicillin salts of anion exchange resins
Assignee: Rohm and Haas Co
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Filing: 1952-04-25
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Granted: 1954-09-14
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Expires: 1972-04-25
Abstract
No abstract record available.
Inventors
- 👤 Charles H Mcburney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:17
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/014
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A PENICILLIN SALT OF AN ANION-EXCHANGE RESIN OF A COPOLYMER OF 99.5 TO 98 PARTS BY WEIGHT OF STYRENE AND 0.5 TO 2 PARTS BY WEIGHT OF DIVINYLBENZENE, SAID COPOLYMER HAVING QUATERNARY AMMONIUM GROUP ATTACHED TO THE AROMATIC NUCLEI THEREOF THROUGH THE METHYLENE LINKAGE, HAVING AS N-SUBSTITUENTS AT LEAST ONE MEMBER FROM THE CLASS CONSISTING OF METHYL, ETHYL, HYDROXYETHYL, AND BENZYL GROUPS AND HAVING PENICILLINATE IONS AS ANIONS THEREOF.
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) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |