US4542167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental cement composition comprising hydroxyapatite and acrylic acid/itaconic acid copolymer hardener
Assignee: Individual
•
Filing: 1984-05-01
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Granted: 1985-09-17
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Expires: 2004-05-01
Abstract
Abstract A water-hardenable dental cement composition comprising hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 ] as the main component and an inorganic powder and a hardening agent.
Inventors
- 👤 Hideki Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; A; A61; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/74; A61K6/75; A61K6/76; A61K6/80; A61K6/802; A61K6/807
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A water-hardenable dental cement composition comprising hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) as the main component and an inorganic powder and a hardening agent consisting of a copolymer of acrylic acid with itaconic acid.
Claim 2
Dependent Claim
38 words
A water-hardenable dental cement composition comprising hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) as the main component and an inorganic powder and a hardening agent consisting of a copolymer of acrylic acid with itaconic acid.
Claim 3
Dependent Claim
38 words
A water-hardenable dental cement composition as set forth in claim 1, wherein the inorganic powder is at least one member selected from calcium tertiary phosphate, calcium oxide, zinc oxide, silicon oxide, aluminum oxide, magnesium oxide, or calcium fluoride.
Claim 4
Dependent Claim
45 words
A water-hardenable dental cement composition as set forth in claim 1, wherein the inorganic powder is added to hydroxy apatite at a weight ratio of 4:1 to 1:4 and the hardening agent is added to the mixture at a weight ratio of 1:9 to 5:5.
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) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |