US4524824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental cement
Assignee: GC Corp
•
Filing: 1983-04-13
•
Granted: 1985-06-25
•
Expires: 2003-04-13
Abstract
Abstract A dental cement comprising a cement powder to which are added one or more of tannic acid derivatives consisting of the group of a tannic acid-protein combination, a tannic acid-formaldehyde combination, acetyl tannate and a metal salt of tannic acid, said tannic acid derivatives being sparingly soluble in water.
Inventors
- 👤 Hirokata Shimokobe
- 👤 Sueo Saito
- 👤 Kentaro Tomioka
- 👤 Shoji Akahane
- 👤 Kazuo Hirota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:03
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A dental cement powder composition comprising a dental cement powder and 0.005-5 percent by weight of one or more of tannic acid derivatives selected from the group consisting of a tannic acid-protein combination, a tannic acid-formaldehyde combination, acetyl tannate and a metal salt of tannic acid, said tannic acid derivatives being sparingly soluble in water, said tannic acid derivative being present in amount sufficient to reduce the solubility of the dental cement formed with the dental cement powder, wherein the dental cement powder is the powder of a dental cement which is a zinc phosphate cement, a polycarboxylate cement prepared from the reaction of a basic component and a polycarboxylic acid or a glass ionomer cement.
Claim 2
Dependent Claim
116 words
A dental cement powder composition comprising a dental cement powder and 0.005-5 percent by weight of one or more of tannic acid derivatives selected from the group consisting of a tannic acid-protein combination, a tannic acid-formaldehyde combination, acetyl tannate and a metal salt of tannic acid, said tannic acid derivatives being sparingly soluble in water, said tannic acid derivative being present in amount sufficient to reduce the solubility of the dental cement formed with the dental cement powder, wherein the dental cement powder is the powder of a dental cement which is a zinc phosphate cement, a polycarboxylate cement prepared from the reaction of a basic component and a polycarboxylic acid or a glass ionomer cement.
Claim 3
Dependent Claim
19 words
A dental cement powder composition as recited in claim 1, in which said tannic acid derivative is albumin tannate.
Claim 4
Dependent Claim
19 words
A dental cement powder composition as recited in claim 1, in which said tannic acid derivative is gelatin tannate.
Claim 5
Dependent Claim
17 words
A dental cement as recited in claim 1, in which said tannic acid derivative is aluminum tannate.
Claim 6
Dependent Claim
17 words
A dental cement as recited in claim 1, in which said tannic acid derivative is zinc tannate.
Claim 7
Dependent Claim
17 words
A dental cement as recited in claim 1, in which said tannic acid derivative is calcium tannate.
References Cited (Backward Citations)
US1612675A
Cited
GB1290627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |