US4451584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding compound for molding body portions and process for producing this molding compound
Assignee: SECANS AG C/O DR BARTH GARTENSTRASSE 2 CH-6300 ZUG SWITZERLAND
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Filing: 1982-05-21
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Granted: 1984-05-29
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Expires: 2002-05-21
Abstract
Abstract A molding compound for molding body portions preferably serves the purpose of producing a counterpart for the production of a model for making prostheses, particularly teeth prostheses or orthopaedic prostheses, or the purpose of cladding such prostheses for adapting same to a changed shape of body portions. This molding compound consists of a silicone containing pressure-elastic hollow microspheres the thin shell of which consists of a vinylidene chloride copolymer and the interior of which contains a gas. This silicone is initially liquid or pasty and, respectively, kneadable and solidifies after a certain time to a rubber-like consistency by adding a hardener, so that the molding compound reproduces the shape of the body portion to be molded.
Inventors
- 👤 Philipp Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:15
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61K; A61K6/00; A61K6/90; C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A molding compound for molding body portions, said molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval when having added a hardener, the silicone being added, prior to solidifying, with pressure-elastic hollow microspheres of a diameter between 0.01 and 0.1 mm, the thin shells of which consist of a vinylidene chloride copolymer and the interior of which contains a gas, the microspheres being present in the compound in an amount between 10 and 85 percent by volume.
Claim 2
Dependent Claim
93 words
A molding compound for molding body portions, said molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval when having added a hardener, the silicone being added, prior to solidifying, with pressure-elastic hollow microspheres of a diameter between 0.01 and 0.1 mm, the thin shells of which consist of a vinylidene chloride copolymer and the interior of which contains a gas, the microspheres being present in the compound in an amount between 10 and 85 percent by volume.
Claim 3
Dependent Claim
18 words
A molding compound according to claim 1 wherein hollow microspheres of different diameters are added to the silicone.
Claim 4
Dependent Claim
26 words
A molding compound according to claim 1 wherein the hollow microspheres are added to the silicone in an amount between 20 and 50 percent by volume.
Claim 5
Dependent Claim
15 words
A molding compound according to claim 1 and having a density between 0.4 and 0.8.
Claim 6
Dependent Claim
92 words
A process for producing a molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval, a hardener and hollow microsphere for molding body portions comprising the steps of: producing hollow microspheres from compact particles containing an inflating agent by heating said particles; adding the resulting hollow microspheres at least to a part of the silicone; and adding a hardener to the silicone so that the silicone is solidified to a rubber-like consistency after a certain time interval.
Claim 7
Dependent Claim
92 words
A process for producing a molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval, a hardener and hollow microsphere for molding body portions comprising the steps of: producing hollow microspheres from compact particles containing an inflating agent by heating said particles; adding the resulting hollow microspheres at least to a part of the silicone; and adding a hardener to the silicone so that the silicone is solidified to a rubber-like consistency after a certain time interval.
Claim 8
Dependent Claim
92 words
A process according to claim 5 wherein compact particles of vinylidene chloride copolymer containing an inflating agent are heated to a temperature exceeding 80° C. for approximately 10 minutes within a receptacle containing water or steam, whereby the hollow microspheres are formed from the compact particles; the hollow microspheres are removed from the receptacle and dried; the hollow microspheres are added to at least part of the silicone; the hardener is added to the silicone containing the hollow microspheres, whereby the compound solidifies to a rubber-like consistency after a certain time interval.
Claim 9
Dependent Claim
113 words
A process for producing a molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval, a hardener and hollow microsphere for molding body portions comprising the steps of: heating at least part of the silicone or the liquid constituent of the molding compound to a temperature exceeding 80° C.; subsequently stirring compact particles of a vinylidene chloride copolymer and containing an inflating agent into the heated silicone, whereby hollow microspheres are formed in situ; and adding a hardener to a silicone containing the hollow microspheres, whereby the compound solidifies to a rubber-like consistency after a certain time interval.
Claim 10
Dependent Claim
113 words
A process for producing a molding compound consisting of a silicone being initially liquid or pasty and, respectively, kneadable and solidifying to a rubber-like consistency after a certain time interval, a hardener and hollow microsphere for molding body portions comprising the steps of: heating at least part of the silicone or the liquid constituent of the molding compound to a temperature exceeding 80° C.; subsequently stirring compact particles of a vinylidene chloride copolymer and containing an inflating agent into the heated silicone, whereby hollow microspheres are formed in situ; and adding a hardener to a silicone containing the hollow microspheres, whereby the compound solidifies to a rubber-like consistency after a certain time interval.
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |