US3844986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sole pressure members sulfoalkyl acrylate-olefin copolymer cation exchangers
Assignee: Mitsui Chemicals Inc
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Filing: 1973-07-11
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Granted: 1974-10-29
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Expires: 1993-07-11
Abstract
Abstract WHEREIN R'' IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND AN ALKYL RADICAL HAVING 1 TO 4 CARBON ATOMS, AND (B) UNITS OF FORMULA (2) -(CH2-C(-R2)(-(CH2)L-COO-(CH2)M-SO3-M))- WHEREIN R2 IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND A METHYL RADICAL, L IS 0 OR AN INTEGERR OF 5 TO 8, M IS 3 OR 4, AND M IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND ALKALI METALS, THE AMOUNT OF THE UNITS OF FORMULA (2) BEING 0.1 TO 5 MILLIEQUIVALENTS PER GRAM OF THE RANDOM COPOLYMER. -(CH2-CH(-R''))- 1. A CATION-EXCHANGEABLE STRUCTURE WHICH CONSISTS OF A WATER-INSOLUBLE RANDOM COPOLYMER HAVING (A) OLEFIN UNITS OF FORMULA (1)
Inventors
- 👤 T Tomatu
- 👤 T Iwata
- 👤 H Oi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:49
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08F; C08F210/00; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2333/00; C08J2333/04; C08J2333/06; C08J2333/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A CATION-EXCHANGEABLE STRUCTURE WHICH CONSISTS OF A WATER-INSOLUBLE RANDOM COPOLYMER HAVING (A) OLEFIN UNITS OF FORMULA (1)
Claim 2
Dependent Claim
17 words
A CATION-EXCHANGEABLE STRUCTURE WHICH CONSISTS OF A WATER-INSOLUBLE RANDOM COPOLYMER HAVING (A) OLEFIN UNITS OF FORMULA (1)
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |