US4225696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic denture prepared from polyurethane elastomer
Assignee: NANGLE JAMES F JR
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Filing: 1979-02-21
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Granted: 1980-09-30
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Expires: 1999-02-21
Abstract
Abstract A hard, substantially non-hydrophilic polyurethane elastomer denture is disclosed in which the elastomer possesses a hardness of not less than about Shore D60 and preferably not greater than about Shore D100. The polyurethane elastomer is prepared from a polyether polyol and an aromatic polyisocyanate in which the isocyanate groups are bonded directly to the aromatic nucleus. The aforesaid hard non-hydrophilic polyurethane elastomer can constitute the entire material of which the denture is made, including the teeth if so desired, or it can be employed as the tooth-holding portion of the denture in combination with a soft, substantially non-hydrophilic elastomer as the mouth-engaging portion of the denture. The hard non-hydrophilic polyurethane elastomer possesses superior resistance to thermal distortion under the conditions prevailing in the mouth.
Inventors
- 👤 Ralph W. Colpitts
- 👤 Jens H. Wendt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:44
CPC Classifications
A; A61; A61C; A61C13/00; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
An artificial denture fabricated from a hard, substantially non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D60, said hard elastomer consisting essentially of the reaction product of a polyether polyol and an aromatic polyisocyanate in which the isocyanate groups are bonded directly to the aromatic nucleus.
Claim 2
Dependent Claim
50 words
An artificial denture fabricated from a hard, substantially non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D60, said hard elastomer consisting essentially of the reaction product of a polyether polyol and an aromatic polyisocyanate in which the isocyanate groups are bonded directly to the aromatic nucleus.
Claim 3
Dependent Claim
26 words
The artificial denture of claim 1 in which the polyether polyol is a polyether diol, triol or tetrol having an equivalent weight of 100 to 800.
Claim 4
Dependent Claim
26 words
The artificial denture of claim 2 in which the polyol is derived from pentaerythritol or glycerol oxyalkylated with ethylene oxide, propylene oxide or a mixture thereof.
Claim 5
Dependent Claim
23 words
The artificial denture of claim 1 in which the aromatic polyisocyanate is 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 3,3'-tolidene 4,4-diisocyanate, diphenylmethane 4,4'-diisocyanate or mixtures thereof.
Claim 6
Dependent Claim
21 words
The artificial denture of claim 1 in which the hard polyurethane elastomer has a hardness not greater than about Shore D100.
Claim 7
Dependent Claim
77 words
The tooth-holding portion of an artificial denture prepared with a hard, substantially non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D60, said hard elastomer consisting essentially of the reaction product of a polyether polyol and an aromatic polyisocyanate in which the isocyanate groups are bonded directly to the aromatic nucleus, said tooth-holding portion being especially adapted to becoming integrally applied to a soft non-hydrophilic elastomer employed as the mouth-engaging portion of the denture.
Claim 8
Dependent Claim
77 words
The tooth-holding portion of an artificial denture prepared with a hard, substantially non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D60, said hard elastomer consisting essentially of the reaction product of a polyether polyol and an aromatic polyisocyanate in which the isocyanate groups are bonded directly to the aromatic nucleus, said tooth-holding portion being especially adapted to becoming integrally applied to a soft non-hydrophilic elastomer employed as the mouth-engaging portion of the denture.
Claim 9
Dependent Claim
21 words
The artificial denture of claim 6 in which the hard polyurethane elastomer has a hardness not greater than about Shore D100.
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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |