Patent US3900672A successfully refreshed from Google Patents.
US3900672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating an optical material and the resulting product
Assignee: Hoya Lens Corp
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Filing: 1973-04-04
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Granted: 1975-08-19
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Expires: 1993-04-04
Abstract
Abstract A process for improving the property of the surface of an optical material by coating the surface with a mixture comprising 25 to 70% by weight of polyacrylic acid, 0.5 to 10% by weight of hexamethoxy methylmelamine, 0.1 to 2% by weight of aminopropyltriethoxysilane 0.01 to 0.1% by weight of polyethylene glycol fatty acid ester and 25 to 75% by weight of a solvent, drying and hardening the coating at a temperature of 50*C to 150*C.
Inventors
- 👤 Vivan Joseph Hammond
- 👤 Peter Norgate
- 👤 Fumio Onoki
- 👤 Hajime Kamiya
- 👤 Kazuaki Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:52
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/02; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/54; C08L; C08L33/00; C08L33/02; C08L71/00; C08L61/00; C08L61/20; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A PROCESS FOR IMPROVING THE PROPERTY OF THE SURFACE OF AN OPTICAL MATERIAL BY PROVIDING A COATING MIXTURE COMPRISING 25 TO 70% BY WEIGHT OF POLYACRYLIC ACID, 0.5 TO 10% BY WEIGHT OF HEXAMETHOXYMETHYLMELAMINE, 0.1 TO 2% BY WEIGHT OF YAMINOPROPYL TRIETHOXYSILANE, 0.01 TO 0.1% BY WEIGHT OF POLYETHYLENE GLYCOL FATTY ACID ESTER AND 25 TO 75% BY WEIGHT OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF 2-ETHOXYETHANOL, ETHYL ALCOHOL, ETHYLENE GLYCOL, MONOETHYL ETHER AND A MIXED SOLUTION OF TWO OR MORE HEREOF, BASED ON THE WEIGHT OF THE MIXTURE, THE SUM OF THE PERCENTAGES BEING 100%, COATING THE SURFACE OF THE OPTICAL MATERIAL WITH SAID MIXTURE BY A SPINNING METHOD AND DRYING AND HARDENING THE COATING AT A HEATING TEMPERATURE OF 50*C TO 150*C TO FORM A COATING HAVING A THICKNESS OF 10UTO 1,000U.
Claim 2
Dependent Claim
136 words
A PROCESS FOR IMPROVING THE PROPERTY OF THE SURFACE OF AN OPTICAL MATERIAL BY PROVIDING A COATING MIXTURE COMPRISING 25 TO 70% BY WEIGHT OF POLYACRYLIC ACID, 0.5 TO 10% BY WEIGHT OF HEXAMETHOXYMETHYLMELAMINE, 0.1 TO 2% BY WEIGHT OF YAMINOPROPYL TRIETHOXYSILANE, 0.01 TO 0.1% BY WEIGHT OF POLYETHYLENE GLYCOL FATTY ACID ESTER AND 25 TO 75% BY WEIGHT OF A SOLVENT SELECTED FROM THE GROUP CONSISTING OF 2-ETHOXYETHANOL, ETHYL ALCOHOL, ETHYLENE GLYCOL, MONOETHYL ETHER AND A MIXED SOLUTION OF TWO OR MORE HEREOF, BASED ON THE WEIGHT OF THE MIXTURE, THE SUM OF THE PERCENTAGES BEING 100%, COATING THE SURFACE OF THE OPTICAL MATERIAL WITH SAID MIXTURE BY A SPINNING METHOD AND DRYING AND HARDENING THE COATING AT A HEATING TEMPERATURE OF 50*C TO 150*C TO FORM A COATING HAVING A THICKNESS OF 10UTO 1,000U.
Claim 3
Dependent Claim
11 words
The optical material improved by the process according to claim 1.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |