US4647600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental cement compositions
Assignee: GC Corp
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Filing: 1986-02-12
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Granted: 1987-03-03
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Expires: 2006-02-12
Abstract
Abstract A dental cement composition consisting of a composition A and a composition B, said composition A comprising at least two powders, (a) 100 parts by weight of a powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting organic acids and/or inorganic acids, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, and said composition B comprising of an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.
Inventors
- 👤 Haruyuki Kawahara
- 👤 Shoji Takeda
- 👤 Hiroshi Oshima
- 👤 Kentaro Tomioka
- 👤 Shoji Akahane
- 👤 Eiichi Yoshii
- 👤 Kazuo Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:22
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/50; A61K6/54; A61K6/80; A61K6/849; A61K6/864; A61K6/876; A61K6/884; A61K6/887; A61K6/889; A61K6/891
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A dental cement composition consisting of a composition A and a composition B, said composition A comprising at least two powders, (a) 100 parts by weight of a powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting organic acids and/or inorganic acids, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, and said composition B comprising of an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.
Claim 2
Dependent Claim
113 words
A dental cement composition consisting of a composition A and a composition B, said composition A comprising at least two powders, (a) 100 parts by weight of a powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting organic acids and/or inorganic acids, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, and said composition B comprising of an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.
Claim 3
Dependent Claim
21 words
A dental cement composition as recited in claim 1, in which said compositions A and/or B contain an X-ray contrast medium.
Claim 4
Dependent Claim
74 words
A dental cement composition as recited in claim 1 or 2, in which said powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting of organic acids and/or inorganic acids is coated with a water-soluble high-molecular substance.
Claim 5
Dependent Claim
35 words
A dental cement composition as recited in claim 1, 2 or 3, in which the viscosity of an aqueous solution of the water-soluble high-molecular substance contained in said composition B is 5 to 5,000 cP.
Claim 6
Dependent Claim
40 words
A dental cement composition as recited in any one of claims 1 to 4, in which the water-soluble high-molecular substance contained in said composition B is at least one selected from polyvinyl pyrrolidone, polyethylene oxide, sodium polyacrylate and sodium polymethacrylate.
References Cited (Backward Citations)
US4591384A
Cited
US4542167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |