US4281992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic denture prepared from polyurethane elastomer
Assignee: Polythetics Inc
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Filing: 1979-11-23
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Granted: 1981-08-04
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Expires: 1999-11-23
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
2026-10-26 07:27
CPC Classifications
A; A61; A61C; A61C13/00; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
An artificial denture comprising (1) a tooth holding portion integrally applied to (2) a mouth engaging portion, the tooth holding portion prepared 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, the mouth engaging portion comprising a soft, substantially non-hydrophilic elastomer.
Claim 2
Dependent Claim
78 words
An artificial denture comprising (1) a tooth holding portion integrally applied to (2) a mouth engaging portion, the tooth holding portion prepared 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, the mouth engaging portion comprising a soft, substantially non-hydrophilic elastomer.
Claim 3
Dependent Claim
62 words
The artificial denture of claim 1 wherein the soft substantially non-hydrophilic polyurethane elastomer comprising the mouth engaging portion has a hardness of not greater than about Shore A65 and not less than about Shore A15 and consists 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 4
Dependent Claim
36 words
The artificial denture of claim 1 in which the hard, substantially non-hydrophilic polyurethane elastomer comprising the tooth holding portion is prepared with a polyether diol, triol or tetrol having an equivalent weight of 100 to 800.
Claim 5
Dependent Claim
26 words
The artificial denture of claim 3 in which the polyol is derived from pentaerythritol or glycerol oxyalkylated with ethylene oxide, propylene oxide or a mixture thereof.
Claim 6
Dependent Claim
33 words
The artificial denture of claim 1 in which the hard, substantially non-hydrophilic polyurethane elastomer comprising the tooth holding portion is prepared from 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 3,3'-tolidene 4,4-diisocyanate, diphenylmethane 4,4'-diisocyanate or mixtures thereof.
Claim 7
Dependent Claim
28 words
The artificial denture of claim 1 in which the hard, substantially non-hydrophilic polyurethane elastomer comprising the tooth holding portion has a hardness not greater than about Shore D100.
Claim 8
Dependent Claim
36 words
The artificial denture of claim 1 in which the soft, substantially non-hydrophilic polyurethane elastomer comprising the mouth engaging portion is prepared from a polyether diol, triol or tetrol having an equivalent weight of 450 to 1500.
Claim 9
Dependent Claim
33 words
The artificial denture of claim 1 in which the soft, substantially non-hydrophilic polyurethane elastomer comprising the mouth engaging portion is prepared from 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 3,3'-tolidene 4,4-diisocyanate, diphenylmethane, 4,4'-diisocyanate or mixtures thereof.
Claim 10
Dependent Claim
81 words
An artificial denture comprising (1) a tooth holding portion and (2) a mouth engaging portion, the tooth holding portion comprising a hard polymeric material, the mouth engaging portion comprising a soft, substantially nonhydrophilic polyurethane elastomer having a hardness of not greater than about Shore A65 and not less than about Shore A15, said soft 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 11
Dependent Claim
81 words
An artificial denture comprising (1) a tooth holding portion and (2) a mouth engaging portion, the tooth holding portion comprising a hard polymeric material, the mouth engaging portion comprising a soft, substantially nonhydrophilic polyurethane elastomer having a hardness of not greater than about Shore A65 and not less than about Shore A15, said soft 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 12
Dependent Claim
36 words
The artificial denture of claim 9 in which the soft, substantially non-hydrophilic polyrethane elastomer comprising the mouth engaging portion is prepared from a polyether diol, triol or tetrol having an equivalent weight of 450 to 1500.
Claim 13
Dependent Claim
33 words
The artificial denture of claim 9 in which the soft, substantially non-hydrophilic polyurethane elastomer comprising the mouth engaging portion is prepared from 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 3,3'-tolidene 4,4-diisocyanate, diphenylmethane 4,4'-diisocyanate or mixtres thereof.
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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |