US4568558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing orthodontic devices and appliances
Assignee: Kulzer GmbH
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Filing: 1985-02-04
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Granted: 1986-02-04
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Expires: 2005-02-04
Abstract
Abstract A method for producing orthodontic devices and appliances by building up a plurality of resin layers on a plaster cast comprising applying a first thin layer of a composition comprising a diurethanedimethacrylate prepared from 2,2,4-trimethylhexamethylenediisocyanate and 2-hydroxyethylmethacrylate, and a photopolymerization catalyst to the plaster cast and briefly exposing said thin layer to light having a wavelength of 400-450 nm whereby said thin layer is partially polymerized, successively applying at least one additional thin layer on said first thin layer and partially polymerizing each successive thin layer by brief exposure to light having a wavelength of 400-450 nm until the layer thickness and shape desired for the device or appliance are attained, and the partially polymerized material is subsequently polymerized completely by exposure to light having a wavelength of 350 nm.
Inventors
- 👤 Michael Angrick
- 👤 Ullrich Trautwein
- 👤 Kurt Lenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:30
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/07; A61C; A61C13/00; A61C13/0003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
Method for producing orthodontic devices and appliances by building up a plurality of resin layers on a plaster cast comprising applying a first thin layer of a composition comprising a diurethanedimethacrylate prepared from 2,2,4-trimethylhexamethylenediisocyanate and 2-hydroxyethylmethacrylate, and a photopolymerization catalyst to the plaster cast and briefly exposing said thin layer to light having a wavelength of 400-450 nm whereby said thin layer is partially polymerized, successively applying at least one additional thin layer on said first thin layer and partially polymerizing each successive thin layer by brief exposure to light having a wavelength of 400-450 nm until the layer thickness and shape desired for the device or appliance are attained, and the partially polymerized material is subsequently polymerized completely by exposure to light having a wavelength of 350 nm.
Claim 2
Dependent Claim
129 words
Method for producing orthodontic devices and appliances by building up a plurality of resin layers on a plaster cast comprising applying a first thin layer of a composition comprising a diurethanedimethacrylate prepared from 2,2,4-trimethylhexamethylenediisocyanate and 2-hydroxyethylmethacrylate, and a photopolymerization catalyst to the plaster cast and briefly exposing said thin layer to light having a wavelength of 400-450 nm whereby said thin layer is partially polymerized, successively applying at least one additional thin layer on said first thin layer and partially polymerizing each successive thin layer by brief exposure to light having a wavelength of 400-450 nm until the layer thickness and shape desired for the device or appliance are attained, and the partially polymerized material is subsequently polymerized completely by exposure to light having a wavelength of 350 nm.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein said composition contains at least 40% by weight of said diurethanedimethacrylate.
Claim 4
Dependent Claim
28 words
The method of claim 2, wherein said composition also contains at least one prepolymer selected from the group consisting of acrylated polyurethane and acrylated epoxy resin and/or bis-[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]-dimethylmethane.
Claim 5
Dependent Claim
17 words
The method of claim 3, wherein said composition also contains at least one low-viscosity acrylate or methacrylate.
Claim 6
Dependent Claim
18 words
The method of claim 4, wherein said composition contains between 40% and 80% by weight of said diurethanedimethacrylate.
Claim 7
Dependent Claim
24 words
The method of claim 5, wherein the composition also contains, as the photopolymerization catalyst, a mixture of one or more ketones and an amine.
Claim 8
Dependent Claim
17 words
The method of claim 6, wherein said photopolymerization catalyst is a mixture of camphorquinone and an amine.
Claim 9
Dependent Claim
31 words
The method of claim 7, wherein said composition contains at least one low-viscosity acrylate or methacrylate selected from the group consisting of 2-hydroxyethylacrylate, tripropyleneglycoldiacrylate, pentaerythrittetraacrylate, butoxyethylacrylate, 2-hydroxyethylmethacrylate, butanedioldimethacrylate, triethyleneglycoldimethacrylate and dodecanediolmethacrylate.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |