Patent US4303701A successfully refreshed from Google Patents.
US4303701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of marking plastic lenses
Assignee: BMC Industries Inc
•
Filing: 1979-12-31
•
Granted: 1981-12-01
•
Expires: 1999-12-31
Abstract
Abstract A method of marking plastic lenses to selectively identify a lens by impregnating a fluorescent material into the surface of the lens so that when the lens is exposed to ultraviolet light it fluoresces.
Inventors
- 👤 Daniel L. Torgersen
- 👤 Leon H. Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:56
CPC Classifications
B; B29; B29D; B29D11/00; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; G02C; G02C7/00; G02C7/02; G02C7/021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
The method of marking a polymer plastic lens having a polymer network comprising applying a fluorescent material to the surface of a plastic lens, allowing sufficient time to permit migration of the fluorescent material into the polymer network and then removing the excess fluorescent material on the surface of the lens.
Claim 2
Independent Claim
51 words
The method of marking a polymer plastic lens having a polymer network comprising applying a fluorescent material to the surface of a plastic lens, allowing sufficient time to permit migration of the fluorescent material into the polymer network and then removing the excess fluorescent material on the surface of the lens.
Claim 3
Dependent Claim
23 words
The invention of claim 1 wherein the formulation of fluorescent material is heated to about 95° C. before applying to the lens surface.
Claim 4
Dependent Claim
16 words
The invention of claim 2 wherein the lens is at room temperature of about 25° C.
Claim 5
Dependent Claim
28 words
The invention of claim 3 wherein the temperature of the lens is raised to about 50° C. before applying the fluorescent material to the surface of the lens.
Claim 6
Independent Claim
69 words
The method of marking a polymer lens having a polymer network comprising selecting a fluorescent material selected from the group consisting of: alkylaminocoumarins, substituted diamines formed by reaction of p-diaminostilbenedisulfonic acid and cyanuric chloride, p-distyrylbiphenyls, naphthotriazolylstilbenes and 1,3-disubstituted pyrazolines; applying the fluorescent material, allowing sufficient time for the fluorescent material to penetrate into the polymer network and then removing the excess fluorescent material on the surface of the lens.
Claim 7
Independent Claim
69 words
The method of marking a polymer lens having a polymer network comprising selecting a fluorescent material selected from the group consisting of: alkylaminocoumarins, substituted diamines formed by reaction of p-diaminostilbenedisulfonic acid and cyanuric chloride, p-distyrylbiphenyls, naphthotriazolylstilbenes and 1,3-disubstituted pyrazolines; applying the fluorescent material, allowing sufficient time for the fluorescent material to penetrate into the polymer network and then removing the excess fluorescent material on the surface of the lens.
Claim 8
Dependent Claim
14 words
A method according to claim 5 wherein the fluorescent material is 7-dimethylamino-4-methylcoumarin or 7-diethylamino-4-methylcoumarin.
References Cited (Backward Citations)
US1475473A
Cited
US1607395A
Cited
US1644798A
Cited
US2542386A
Cited
US2848348A
Cited
GB1439173A
Cited
US4157892A
Cited
US4146696A
Cited
US4039827A
Cited
US4238524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |