Patent US4389496A successfully refreshed from Google Patents.
US4389496A
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US
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Thixotropic formulations of silicone pastes for impressions of teeth and mucous membrane
Assignee: Kulzer GmbH
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Filing: 1981-11-12
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Granted: 1983-06-21
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Expires: 2001-11-12
Abstract
Abstract The invention relates to thixotropic formulations of silicone pastes for the production of exact impressions of teeth and mucous membrane.
Inventors
- 👤 Bernhard Leusner
- 👤 Hans-Hermann Schulz
- 👤 Reiner Voigt
- 👤 Michael Walkowiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:52
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; A; A61; A61K; A61K6/00; A61K6/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A thixotropic silicone paste for the production of impressions, said paste consisting essentially of (a) 50-90%, based on the weight of the paste, of a silicone oil with terminal hydroxyl groups; (b) 1-15%, based on the weight of the paste, of an organic thixotropic agent; and (c) 5-50% of calcium silicate, wherein (i) said calcium silicate has a specific surface area of 20 to 100 m 2 /g (measured by the BET method) and (ii) said thixotropic agent is selected from the group consisting of hydrogenated castor oil and polyglycol ethers of glycerides.
Claim 2
Dependent Claim
93 words
A thixotropic silicone paste for the production of impressions, said paste consisting essentially of (a) 50-90%, based on the weight of the paste, of a silicone oil with terminal hydroxyl groups; (b) 1-15%, based on the weight of the paste, of an organic thixotropic agent; and (c) 5-50% of calcium silicate, wherein (i) said calcium silicate has a specific surface area of 20 to 100 m 2 /g (measured by the BET method) and (ii) said thixotropic agent is selected from the group consisting of hydrogenated castor oil and polyglycol ethers of glycerides.
Claim 3
Dependent Claim
15 words
A paste according to claim 1 wherein said thixotropic agent is glycerol monostearate polyglycol ether.
Claim 4
Dependent Claim
22 words
A paste according to claim 1 in which the silicone oil has a viscosity of 500 to 20,000 mPa.s at 23° C.
Claim 5
Dependent Claim
23 words
A paste according to claim 1 or 2 in which the silicone oil has a viscosity of about 2,000 mPa.s at 23° C.
Claim 6
Dependent Claim
28 words
A paste according to claim 1 in which the calcium silicate has a specific surface area of 35 to 65 m 2 /g (measured by the BET method).
Claim 7
Dependent Claim
26 words
A paste according to claim 1 in which the calcium silicate has a specific area of about 50 m 2 /g (measured by the BET method).
Claim 8
Dependent Claim
24 words
A paste according to claim 1, which has a viscosity between 100,000 and 10,000 mPa.s at 23° C. and is suitable for correction impressions.
Claim 9
Dependent Claim
22 words
A paste according to claim 1 which has a viscosity between 800,00 and 30,000 mPa.s and is suitable for mucous membrane impressions.
Claim 10
Dependent Claim
20 words
A paste according to claim 1 having a viscosity over 350,000 mPa.s and suitable for kneading to produce extension areas.
Claim 11
Dependent Claim
18 words
A paste according to claim 9 which has a viscosity between 350,000 and 1,000,000 mPa.s at 23° C.
Claim 12
Dependent Claim
40 words
A paste according to claims 1 or 2 which is crosslinked with a crosslinking/catalyst component consisting of a silicic acid O-ester, a polysilicic acid ester or a substituted silane crosslinking agent and a metal salt of an organic monocarboxylic acid.
Claim 13
Dependent Claim
30 words
An impression of teeth and mucous membrane which has been formed by applying to said teeth and mucous membrane a paste as claimed in claim 1 incorporating a catalyst/crosslinking component.
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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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |