US4135792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
All plastic spectacles
Assignee: AO Inc
•
Filing: 1977-08-11
•
Granted: 1979-01-23
•
Expires: 1997-08-11
Abstract
Abstract Warpage-free spectacles comprised of plastic lenses and plastic frames wherein the frames are constructed of materials having the same or lower tensile elastic modulus and/or the same coefficient of thermal expansion as the lens material.
Inventors
- 👤 Emil W. Deeg
- 👤 Edward A. Travnicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:46
CPC Classifications
G; G02; G02C; G02C1/00; G02C1/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
472 words
In the art of manufacturing spectacles with frame fronts having plastic lens supporting rims and plastic lenses supported therein, the invention comprising: a series of plastic spectacles with rim and lens material combinations having compatible tensile elastic moduli and coefficients of linear thermal expansion for avoidance of spectacles lens loosening and warpage due to tightening in supporting rims under changes in environmental temperatures, said series of spectacles comprising the particular combinations of frame and lens materials charted by the symbols X in the following Table I TABLE I
______________________________________
Lens Materials
Cast Acrylic
Poly Carbonates
(PMMA) (unfilled)
E = 3.5 -4.5
E = 3.0 -3.5
Frame α = 5.0 -9.0
α = 6.6
Materials n = 1.48 -1.50
n = 1.586
______________________________________
Acetal Homopolymer
E = 5.2
α = 8.1
ABS - clear
(acrylonitrile-butadiene-
styrene)
E = 2.9
α = 8.3 X
ABS - high impact
(acrylonitrile-butadiene-
styrene)
E = 2.4 -3.4
α =9.0 -13.0
X
ABS - medium impact
(acrylonitrile-butadiene-
styrene)
E = 3.0 -4.5
α = 8.0 -10.0
X
ABS - high heat resistant
(acrylonitrile-butadiene-
styrene)
E = 2.9 -4.2
α =6.0 -9.3
X X
Epoxy - cast unfilled
(diglycidal ether of
bisphenol A)
E = 3.5
α = 4.5 -6.5
X X
Epoxy - flexibilized
(diglycidal ether of
bisphenol A)
E = 0.1 -3.5
α = 2.0 -10.0
X X
Polycarbonate (unfilled)
E = 3.0 -3.5
α = 6.6 X X
Polyvinylchloride (rigid)
E = 3.5 -6.0
α = 5.0 -10.0
X X
Allyldiglycolcarbonate
(clear)
E = 3.0
α = 8.1 -14.3
X X
Cellulose acetate
E = 0.65 -4.0
α = 8.0 -18.0
X X
Lens Materials
Polystyrene Allyldiglycol-
(unfilled) carbonate
E = 4.0 -6.0
E = 3.0
Frame α = 6.0 -8.0
α = 8.1 -14.3
Materials n = 1.59 -1.60
n = 1.50
______________________________________
Acetal Homopolymer
E = 5.2
α = 8.1 X X
ABS - clear
(acrylonitrile-butadiene-
styrene)
E = 2.9
α = 8.3 X
ABS - high impact
(acrylonitrile-butadiene-
styrene)
E = 2.4 -3.4
α = 9.0 -13.0 X
ABS - medium impact
(acrylonitrile-butadiene-
styrene)
E = 3.0 -4.5
α = 8.0 -10.0
X X
ABS - high heat resistant
(acrylonitrile-butadiene-
styrene)
E = 2.9 -4.2
α = 6.0 -9.3
X X
Epoxy - cast unfilled
(diglycidal ether of
bisphenol A)
E = 3.5
α = 4.5 -6.5
Epoxy - flexibilized
(diglycidal ether of
bisphenol A)
E = 0.1 -3.5
α = 2.0 -10.0
X X
Polycarbonate (unfilled)
E = 3.0 -3.5
α = 6.6 X
Polyvinylchloride (rigid)
E = 3.5 -6.0
α = 5.0 -10.0
X X
Allyldiglycolcarbonate
(clear)
E = 3.0
α =8.1 -14.3 X
Cellulose acetate
E = 0.65 -4.0
α = 8.0 -18.0
X X
______________________________________
E = tensile elastic modulus in psi .
α = coefficient of linear thermal expansion in (degr. C).sup.-1 .
10.sup.-5
n = refractive index
Claim 2
Dependent Claim
472 words
In the art of manufacturing spectacles with frame fronts having plastic lens supporting rims and plastic lenses supported therein, the invention comprising: a series of plastic spectacles with rim and lens material combinations having compatible tensile elastic moduli and coefficients of linear thermal expansion for avoidance of spectacles lens loosening and warpage due to tightening in supporting rims under changes in environmental temperatures, said series of spectacles comprising the particular combinations of frame and lens materials charted by the symbols X in the following Table I TABLE I
______________________________________
Lens Materials
Cast Acrylic
Poly Carbonates
(PMMA) (unfilled)
E = 3.5 -4.5
E = 3.0 -3.5
Frame α = 5.0 -9.0
α = 6.6
Materials n = 1.48 -1.50
n = 1.586
______________________________________
Acetal Homopolymer
E = 5.2
α = 8.1
ABS - clear
(acrylonitrile-butadiene-
styrene)
E = 2.9
α = 8.3 X
ABS - high impact
(acrylonitrile-butadiene-
styrene)
E = 2.4 -3.4
α =9.0 -13.0
X
ABS - medium impact
(acrylonitrile-butadiene-
styrene)
E = 3.0 -4.5
α = 8.0 -10.0
X
ABS - high heat resistant
(acrylonitrile-butadiene-
styrene)
E = 2.9 -4.2
α =6.0 -9.3
X X
Epoxy - cast unfilled
(diglycidal ether of
bisphenol A)
E = 3.5
α = 4.5 -6.5
X X
Epoxy - flexibilized
(diglycidal ether of
bisphenol A)
E = 0.1 -3.5
α = 2.0 -10.0
X X
Polycarbonate (unfilled)
E = 3.0 -3.5
α = 6.6 X X
Polyvinylchloride (rigid)
E = 3.5 -6.0
α = 5.0 -10.0
X X
Allyldiglycolcarbonate
(clear)
E = 3.0
α = 8.1 -14.3
X X
Cellulose acetate
E = 0.65 -4.0
α = 8.0 -18.0
X X
Lens Materials
Polystyrene Allyldiglycol-
(unfilled) carbonate
E = 4.0 -6.0
E = 3.0
Frame α = 6.0 -8.0
α = 8.1 -14.3
Materials n = 1.59 -1.60
n = 1.50
______________________________________
Acetal Homopolymer
E = 5.2
α = 8.1 X X
ABS - clear
(acrylonitrile-butadiene-
styrene)
E = 2.9
α = 8.3 X
ABS - high impact
(acrylonitrile-butadiene-
styrene)
E = 2.4 -3.4
α = 9.0 -13.0 X
ABS - medium impact
(acrylonitrile-butadiene-
styrene)
E = 3.0 -4.5
α = 8.0 -10.0
X X
ABS - high heat resistant
(acrylonitrile-butadiene-
styrene)
E = 2.9 -4.2
α = 6.0 -9.3
X X
Epoxy - cast unfilled
(diglycidal ether of
bisphenol A)
E = 3.5
α = 4.5 -6.5
Epoxy - flexibilized
(diglycidal ether of
bisphenol A)
E = 0.1 -3.5
α = 2.0 -10.0
X X
Polycarbonate (unfilled)
E = 3.0 -3.5
α = 6.6 X
Polyvinylchloride (rigid)
E = 3.5 -6.0
α = 5.0 -10.0
X X
Allyldiglycolcarbonate
(clear)
E = 3.0
α =8.1 -14.3 X
Cellulose acetate
E = 0.65 -4.0
α = 8.0 -18.0
X X
______________________________________
E = tensile elastic modulus in psi .
α = coefficient of linear thermal expansion in (degr. C).sup.-1 .
10.sup.-5
n = refractive index
Claim 3
Dependent Claim
17 words
Spectacles according to claim 1 wherein said lens rims and lenses have the same tensile elastic modulus.
Claim 4
Dependent Claim
17 words
Spectacles according to claim 1 wherein said rims have a lower tensile elastic modulus than said lenses.
Claim 5
Dependent Claim
19 words
Spectacles according to claim 1 wherein said lens rims and lenses have approximately the same coefficient of thermal expansion.
Claim 6
Dependent Claim
13 words
Spectacles according to claim 1 wherein said lenses are cemented to said rims.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |