US4329378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for marking an indication to the lens
Assignee: Hoya Lens Corp
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Filing: 1979-12-11
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Granted: 1982-05-11
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Expires: 1999-12-11
Abstract
Abstract Plastic eyeglass lenses and the like are marked with an identifying character or symbol by applying to the surface thereof or dissolving or comelting therein a flourescent dyestuff according to the disclosed method. When the proper amount of flourescent dyestuff is included the lens appears normal in sunlight but is characteristically marked in whole or in part under ultraviolet light depending on the area treated.
Inventors
- 👤 Niro Tarumi
- 👤 Makoto Tsuchiya
- 👤 Kunio Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:49
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/021; B; B29; B29D; B29D11/00; B41; B41M; B41M1/00; B41M1/26; B41M1/30; B41M3/00; B41M3/06; G02B; G02B1/00; G02B1/04; G02B1/041; B29K; B29K2995/00; B29K2995/0018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A method of marking an indication on a plastic eyeglass lens which indication is visible only in ultraviolet light, said process comprising the steps of: (1) printing the desired symbol or letter on the plastic lens surface with a fluorescent dyestuff present to the extent of about 0.05 to about 10% by weight, said dye-stuff contained in an organic solvent solution, and thereafter (2) drying the thus printed fluorescent dyestuff solution at about 60° to about 90° C. for 1 to 10 minutes thereby causing the fluorescent dyestuff solution to be transmitted into the interior of the pastic lens.
Claim 2
Independent Claim
99 words
A method of marking an indication on a plastic eyeglass lens which indication is visible only in ultraviolet light, said process comprising the steps of: (1) printing the desired symbol or letter on the plastic lens surface with a fluorescent dyestuff present to the extent of about 0.05 to about 10% by weight, said dye-stuff contained in an organic solvent solution, and thereafter (2) drying the thus printed fluorescent dyestuff solution at about 60° to about 90° C. for 1 to 10 minutes thereby causing the fluorescent dyestuff solution to be transmitted into the interior of the pastic lens.
Claim 3
Dependent Claim
26 words
The method according to claim 1 wherein the dyestuff is dissolved in an alcohol selected from the group consisting of methanol, ethanol, isopropanol and benzyl alcohol.
Claim 4
Dependent Claim
21 words
The method according to claim 1 or claim 2 wherein said solution also contains glycerine up to about 10% by weight.
Claim 5
Dependent Claim
28 words
The method according to claim 1 or claim 2 wherein said solution is absorbed in a rubber stamp which prints the letter or symbol on the lens surface.
References Cited (Backward Citations)
GB569920A
Cited
GB1004424A
Cited
FR1400566A
Cited
US3700487A
Cited
US4186020A
Cited
US4108827A
Cited
US4139694A
Cited
FR2406217B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |