Patent US2508112A successfully refreshed from Google Patents.
US4089830A
Expired / Lapsed
US
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Setting solution for dental glass ionomer cements
Assignee: GC Corp
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Filing: 1976-10-08
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Granted: 1978-05-16
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Expires: 1996-10-08
Abstract
Abstract An aqueous setting solution for dental glass ionomer cements comprising 45 to 60% of polyacrylic acid or acrylic acid copolymer and 7 to 25% of one or more of polybasic carboxylic acids based on the total weight.
Inventors
- 👤 Chojiro Tezuka
- 👤 Yoshimitsu Karasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:12
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
An aqueous setting solution for dental ionomer cements comprising: (a) 45 to 60% of a polymer having a molecular weight of less than 30,000 and selected from the group consisting of polyacrylic acid and a copolymer of acrylic acid and at least one monomer selected from the group consisting of 2-chloroacrylic acid, 2-bromoacrylic acid, maleic acid, fumaric acid, itaconic acid, methacrylic acid, mesaconic acid, acrylonitrile, methyl acrylate, methyl methacrylate, vinyl acetate, vinyl propionate, methyl itaconate, styrene and 2-hydroxylethyl methacrylate; and (B) 7-25% of polybasic carboxylic acid selected from the group consisting of citric acid, maleic acid, malic acid, tartaric acid, itaconic acid, aconitic acid and tricarballic acid.
Claim 2
Dependent Claim
107 words
An aqueous setting solution for dental ionomer cements comprising: (a) 45 to 60% of a polymer having a molecular weight of less than 30,000 and selected from the group consisting of polyacrylic acid and a copolymer of acrylic acid and at least one monomer selected from the group consisting of 2-chloroacrylic acid, 2-bromoacrylic acid, maleic acid, fumaric acid, itaconic acid, methacrylic acid, mesaconic acid, acrylonitrile, methyl acrylate, methyl methacrylate, vinyl acetate, vinyl propionate, methyl itaconate, styrene and 2-hydroxylethyl methacrylate; and (B) 7-25% of polybasic carboxylic acid selected from the group consisting of citric acid, maleic acid, malic acid, tartaric acid, itaconic acid, aconitic acid and tricarballic acid.
Claim 3
Dependent Claim
19 words
The aqueous setting solution of claim 1, wherein said polymer has a molecular weight of from 5,000 to 20,000.
Claim 4
Dependent Claim
19 words
The aqueous setting solution of claim 1, wherein from 10 to 15% of said polybasic carboxylic acid is present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |