US4024636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dentures
Assignee: NANGLE JAMES F JR
•
Filing: 1975-07-11
•
Granted: 1977-05-24
•
Expires: 1995-07-11
Abstract
Abstract A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.
Inventors
- 👤 Ralph W. Colpitts
- 👤 Kurt C. Frisch
- 👤 Adolfas Damusis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:20
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/01; A61C13/04; A61C13/0025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass.
Claim 2
Dependent Claim
79 words
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass.
Claim 3
Dependent Claim
42 words
The denture of claim 1, in which the hard non-hydrophilic polyurethane elastomer teeth have a hardness of not greater than Shore D 70 and the soft non-hydrophilic polyurethane elastomer gum member has a hardness of not less than about Shore D 15.
Claim 4
Dependent Claim
109 words
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth-engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass and in which the hard and soft polyurethane elastomers are cross-linked hard and soft isocyanate-terminated prepolymers, respectively, and have a NCO/OH ratio of about 1.05 to 1.0 to 1.1 to 1.0.
Claim 5
Dependent Claim
109 words
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth-engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass and in which the hard and soft polyurethane elastomers are cross-linked hard and soft isocyanate-terminated prepolymers, respectively, and have a NCO/OH ratio of about 1.05 to 1.0 to 1.1 to 1.0.
Claim 6
Dependent Claim
19 words
The denture of claim 3, in which the soft prepolymer is essentially linear, and the hard prepolymer is branched.
Claim 7
Dependent Claim
38 words
The denture of claim 4, in which the soft prepolymer has a free NCO content between about 3.7 and about 5.5 percent and the hard prepolymer has a free NCO content between about 9.5 and about 14 percent.
Claim 8
Dependent Claim
42 words
The denture of claim 5, in which the polyol component of the soft prepolymer is poly(oxytetramethylene) glycol, the polyol component of the hard prepolymer is a mixture of poly(oxytetramethylene) glycol and the poly(oxypropyl-derivative of trimethylolpropane and the isocyanate component is 4,4-dicyclohexylmethane diisocyanate.
Claim 9
Dependent Claim
23 words
The denture of claim 6, in which the cross-linking agent is poly(oxypropylene) derivative of ethylene diamine having a molecular weight of about 490.
Claim 10
Dependent Claim
20 words
The denture of claim 6, in which the crosslinking agent is poly(oxypropylene) adduct of pentaerythritol of about 500 molecular weight.
Claim 11
Dependent Claim
40 words
The denture of claim 6, in which the cross-linking agent is a polyurethane prepolymer-polyol blend in which the prepolymer has neither free NCO nor free hydroxyl groups and the polyol is a polyether polyol having a functionality more than 2.
References Cited (Backward Citations)
US3241238A
Cited
US3727309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |