Patent DE2503835A1 successfully refreshed from Google Patents.
US3930076A
Expired / Lapsed
US
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Method for providing dentures with a soft hydrogel layer
Assignee: Individual
•
Filing: 1973-07-13
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Granted: 1975-12-30
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Expires: 1993-07-13
Abstract
Abstract A hard acrylic denture has a soft hydrogel layer applied thereto in the form of a paste consisting essentially of hydrophilic monomer, active filler, preferably finely divided silica, and a suitable solvent, with or without a hydrophobic monomer. The composition is then polymerized in place to give a soft hydrogel layer with a more regular structure than that previously attained.
Inventors
- 👤 Karel Kliment
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:43
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0025; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
34 words
A METHOD OF PROVIDING DENTURES HAVING A HARD POLYMERIC ACRYLIC BASE WITH A SOFT HYDROGEL LAYER COMPRISING THE STEPS OF: PREPARING A PASTE CONSISTING ESSENTIALLY OF: 1A. A LIQUID HYDROPHILIC MONOMER OF THE FORMULA
Claim 2
Independent Claim
34 words
A METHOD OF PROVIDING DENTURES HAVING A HARD POLYMERIC ACRYLIC BASE WITH A SOFT HYDROGEL LAYER COMPRISING THE STEPS OF: PREPARING A PASTE CONSISTING ESSENTIALLY OF: 1A. A LIQUID HYDROPHILIC MONOMER OF THE FORMULA
Claim 3
Dependent Claim
19 words
AN ANHYDROUS WATER SOLUBLE SOLVENT CAPABLE OF DISSOLVING SAID HARD POLYMERIC ACRYLIC BASE BUT NOT THE SOFT HYDROGEL; AND
Claim 4
Dependent Claim
19 words
AN ANHYDROUS WATER SOLUBLE SOLVENT CAPABLE OF DISSOLVING SAID HARD POLYMERIC ACRYLIC BASE BUT NOT THE SOFT HYDROGEL; AND
Claim 5
Dependent Claim
19 words
an anhydrous water soluble solvent capable of dissolving said hard polymeric acrylic base but not the soft hydrogel; and
Claim 6
Dependent Claim
19 words
an anhydrous water soluble solvent capable of dissolving said hard polymeric acrylic base but not the soft hydrogel; and
Claim 7
Dependent Claim
22 words
A process according to claim 1 wherein the copolymerizable ethylenically unsaturated monomer is a cross-linking agent, an alkoxy compound of the formula
Claim 8
Dependent Claim
27 words
a finely divided inert filler; applying said paste to the hard polymeric acrylic base; and polymerizing said paste to form a hydrophilic polymer coating on said base.
Claim 9
Dependent Claim
27 words
a finely divided inert filler; applying said paste to the hard polymeric acrylic base; and polymerizing said paste to form a hydrophilic polymer coating on said base.
Claim 10
Dependent Claim
27 words
A FINELY DIVIDED INERT FILLER; APPLYING SAID PASTE TO THE HARD POLYMERIC ACRYLIC BASE; AND POLYMERIZING SAID PASTE TO FORM A HYDROPHOLIC POLYMER COATING ON SAID BASE.
Claim 11
Dependent Claim
27 words
A FINELY DIVIDED INERT FILLER; APPLYING SAID PASTE TO THE HARD POLYMERIC ACRYLIC BASE; AND POLYMERIZING SAID PASTE TO FORM A HYDROPHOLIC POLYMER COATING ON SAID BASE.
Claim 12
Dependent Claim
24 words
A process according to claim 2 wherein the filler is silica, alumina, diatomaceous earth, bentonite clay, talc, fuller''s earth, glass, quartz or calcium carbonate.
Claim 13
Dependent Claim
34 words
A process according to claim 1 including the step of removing said solvent after the hydrophilic polymer coating is formed on said base and replacing it with water to form said soft hydrogel layer.
Claim 14
Dependent Claim
16 words
A process according to claim 4 wherein the solvent contains at least one alcoholic hydroxyl group.
Claim 15
Dependent Claim
52 words
A process according to claim 4 wherein the solvent is an alkanol having 1 to 4 carbon atoms, a glycol or glycerine partial acetate ester, acetic acid, a lower alkylene glycol, a lower alkoxy lower alkanol, a poly(lower alkoxy) lower alkanol, glycerine, pentaerythritol, tetrahydrofurfuryl alcohol, allyl alcohol, ethylene carbonate, and propylene carbonate.
Claim 16
Dependent Claim
40 words
A process according to claim 4 wherein (1) is present in an amount of 50 to 97 percent, (2) is present in an amount up to 40 percent, and (3) is present in an amount of 3 to 10 percent.
Claim 17
Dependent Claim
20 words
A process according to claim 7 wherein polymerization is carried out with a polymerization initiator under free radical polymerization conditions.
Claim 18
Dependent Claim
24 words
A process according to claim 7 wherein the filler is silica, alumina, diatomaceous earth, bentonite clay, talc, fuller''s earth, glass, quartz or calcium carbonate.
Claim 19
Dependent Claim
11 words
A process according to claim 9 wherein the filler is silica.
Claim 20
Dependent Claim
30 words
A process according to claim 10 wherein (1) is present in an amount of 65 to 80 percent and (2) is present in an amount of 12 to 25 percent.
Claim 21
Dependent Claim
18 words
A process according to claim 11 wherein (3) is present in an amount of 6 to 8 percent.
Claim 22
Dependent Claim
17 words
A process according to claim 11 where R is methyl, n is 2 and x is 0.
Claim 23
Dependent Claim
30 words
A process according to claim 4 wherein (1) is (b) and the copolymerizable monomer includes 0.05 to 20 percent of a cross-linking agent based on the total of polymerizable monomers.
Claim 24
Dependent Claim
13 words
A process according to claim 14 wherein the cross-linking agent has the formula
Claim 25
Dependent Claim
12 words
A process according to claim 15 wherein the x group are zero.
Claim 26
Dependent Claim
19 words
A process according to claim 16 wherein all the n''s are 2 and all the R groups are methyl.
Claim 27
Dependent Claim
27 words
A process according to claim 14 wherein the copolymerizable monomers include 1 to 60 percent based on the total monomers of an alkoxy compound of the formula
Claim 28
Dependent Claim
35 words
A process according to claim 18 wherein the alkoxy compound is present in an amount of 5 to 25 percent, R2 is alkyl of 1 to 4 carbon atoms and m is 2 or 3.
Claim 29
Dependent Claim
15 words
A process according to claim 14 wherein the copolymerizable monomer additionally includes an alkoxy compound
Claim 30
Dependent Claim
37 words
A process according to claim 14 wherein the copolymerizable monomers include 0.1 to 25 percent based on the total monomers of a water solubilizing ethylenically unsaturated amine, carboxylic acid, amide, sulfoalkyl acrylate or methacrylate, or vinyl pyrrolidone.
Claim 31
Dependent Claim
19 words
A process according to claim 21 wherein there is present 5 to 15 percent of said water solubilizing compound.
Claim 32
Dependent Claim
36 words
A process according to claim 14 additionally including 0.1 to 15 percent based on the total monomers of an ethylenically unsaturated carboxylic acid or a hydroxy lower alkyl partial ester of an ethylenically unsaturated polycarboxylic acid.
Claim 33
Dependent Claim
23 words
A process according to claim 14 additionally including 1 to 25 percent based on the total monomers of an alkyl acrylate or methacrylate.
Claim 34
Dependent Claim
18 words
A process according to claim 14 wherein (1) is a mixture of hydroxyethyl methacrylate and ethylene glycol dimethacrylate.
Claim 35
Dependent Claim
15 words
A process according to claim 14 wherein the solvent is glycerol monoacetate or glycerol diacetate.
Claim 36
Dependent Claim
14 words
A process according to claim 25 wherein the inert filler is finely divided silica.
Claim 37
Dependent Claim
24 words
A hard polymeric acrylic denture base having an outer coating of a soft hydrophilic polymer hydrogel layer prepared by the process of claim 27.
Claim 38
Dependent Claim
24 words
A hard polymeric acrylic denture base having an outer coating of a soft hydrophilic polymer hydrogel layer prepared by the process of claim 4.
References Cited (Backward Citations)
US3220960A
Cited
US3446875A
Cited
US3496254A
Cited
US3607848A
Cited
US3628988A
Cited
US3822089A
Cited
US3618213A
Cited
US3758448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |