Patent US4342677A successfully refreshed from Google Patents.
US4342677A
Expired / Lapsed
US
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Fluorocomplex salt-containing liquid for setting dental cements
Assignee: GC Corp
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Filing: 1981-05-14
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Granted: 1982-08-03
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Expires: 2001-05-14
Abstract
Abstract A liquid for setting dental cements comprising a aqueous solution of a copolymer of acryclic acid and maleic acid, tartaric acid and one or more fluorocomplex salt.
Inventors
- 👤 Hiroaki Muramatsu
- 👤 Kentaro Tomioka
- 👤 Kazuo Hirota
- 👤 Shoji Akahane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:45
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
A liquid for setting dental cements comprising an aqueous solution of 45 to 55% by weight of a copolymer of acrylic acid and maleic acid containing tartaric acid and one or more fluorocomplex salts in amounts of 0.1 to 5% on the basis of the total weight.
Claim 2
Dependent Claim
47 words
A liquid for setting dental cements comprising an aqueous solution of 45 to 55% by weight of a copolymer of acrylic acid and maleic acid containing tartaric acid and one or more fluorocomplex salts in amounts of 0.1 to 5% on the basis of the total weight.
Claim 3
Dependent Claim
84 words
A liquid for setting dental cements as recited in claim 1, in which the fluorocomplex salt used is selected from the group consisting of potassium tetrafluoroberyllate, ammonium tetrafluoroberyllate, sodium hexafluorozirconate, potassium hexafluorozirconate, potassium heptafluoroniobate, potassium heptafluorotantalate, sodium hexafluorosilicate, potassium hexafluorosilicate, lithium hexafluorosilicate, ammonium hexafluorosilicate, iron hexafluorosilicate, nickel hexafluorosilicate, zinc hexafluorosilicate, tin hexafluorosilicate, magnesium hexafluorosilicate, sodium hexafluorotitanate, potassium hexafluorotitanate, ammonium hexafluorotitanate, nickel hexafluorotitanate, potassium tetrafluoroborate, ammonium tetrafluoroborate, manganese tetrafluoroborate, iron tetrafluoroborate, nickel tetrafluoroborate, tin tetrafluoroborate, indium tetrafluoroborate, zinc tetrafluoroborate, antimony tetrafluoroborate, and boron trifluoride-acetate complex.
Claim 4
Dependent Claim
41 words
A liquid for setting dental cements as recited in claim 2, in which the fluorocomplex salts used is selected from the group consisting of potassium tetrafluoroberyllate, sodium hexafluorozirconate, potassium hexafluorozirconate, zinc hexafluorosilicate, magnesium hexafluorosilicate, sodium hexafluorotitanate, potassium hexafluorotitanate and ammonium hexafluorotitanate.
Claim 5
Dependent Claim
19 words
A liquid for setting dental cement according to claim 1, containing 10 to 25% by weight of tartaric acid.
Claim 6
Dependent Claim
60 words
A liquid for setting dental cements as recited in claim 1, in which the copolymer of acrylic acid and maleic acid has an average molecular weight of no more than 30,000, preferably 20,000 to 5,000 as calculated from the following equation: [η]=1.2×10.sup.-3 ×M.sup.0.54 (100 ml/g, 25°) wherein [η] stands for an intrinsic viscosity; and M denotes an average molecular weight.
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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) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |