Patent US3856737A successfully refreshed from Google Patents.
US3856737A
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US
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Surgical cements of improved compressive strength containing stannous flouride and polyacrylic acid
Assignee: Amalgamated Dental Co Ltd
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Filing: 1973-01-16
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Granted: 1974-12-24
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Expires: 1993-01-16
Abstract
Abstract A pack for the preparation of a surgical cement comprises a solid component (a) comprising zinc oxide together with at least 2 percent by weight, based on the weight of zinc oxide, of stannous fluoride, and a liquid component (b) comprising an aqueous solution of polyacrylic acid. The surgical cement is prepared by mixing component (a) with component (b) suitably in a weight ratio of 0.05 -4 to 1.
Inventors
- 👤 J Foster
- 👤 E Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:09
CPC Classifications
A; A61; A61C; A61C13/00; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A SURGICAL CEMENT CONSISTING ESSENTIALLY OF (A) ZINC OXIDE TOGETHER WITH FROM 5 TO 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID ZINC OXIDE, OF STANNOUS FLUORIDE, AND (B) AN AQUEOUS SOLUTION OF POLYACRYLIC ACID HAVING A VISCOSITY DETERMINED MOLECULAR WEIGHT OF ROM 15,000 TO 150,000; SAID CEMEMNT COMPRISING FROM 0.5 TO 4 PARTS BY WEIGHT OF COMPONENT (A) PER PART BY WEIGHT OF COMPONENT (B).
Claim 2
Dependent Claim
68 words
A SURGICAL CEMENT CONSISTING ESSENTIALLY OF (A) ZINC OXIDE TOGETHER WITH FROM 5 TO 10 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID ZINC OXIDE, OF STANNOUS FLUORIDE, AND (B) AN AQUEOUS SOLUTION OF POLYACRYLIC ACID HAVING A VISCOSITY DETERMINED MOLECULAR WEIGHT OF ROM 15,000 TO 150,000; SAID CEMEMNT COMPRISING FROM 0.5 TO 4 PARTS BY WEIGHT OF COMPONENT (A) PER PART BY WEIGHT OF COMPONENT (B).
Claim 3
Dependent Claim
22 words
The surgical cement according to claim 1 in which component (a) contains from 5 to 10 percent by weight of stannous fluoride.
Claim 4
Dependent Claim
28 words
The surgical cement according to claim 1 in which component (b) consists essentially of an aqueous solution containing at least 40 percent by weight of said polyacrylic acid.
Claim 5
Dependent Claim
35 words
The surgical cement according to claim 1 in which component (a) also contains a minor proportion of metal salt or oxide selected from the group consisting of magnesium oxide, silica, aluminum oxide, and mixtures thereof.
Claim 6
Dependent Claim
20 words
The surgical cement according to claim 1 in which the zinc oxide in component (a) has been deactivated by heating.
Claim 7
Dependent Claim
25 words
The surgical cement according to claim 5 in which the zinc oxide has been deactivated by heating at about 1,000*C. for up to 40 hours.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |