US4222747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing material for ophthalmic lenses
Assignee: EssilorLuxottica SA
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Filing: 1978-12-27
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Granted: 1980-09-16
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Expires: 1998-12-27
Abstract
Abstract The invention relates to a polishing material of the type containing powdered cerium oxide suspended in water. According to the invention, this polishing material also contains, in combination, a substance for use as a thickener and a substance for reducing the surface tension. The polishing material is particularly useful for polishing ophthalmic lenses made from organic materials.
Inventors
- 👤 Jean-Claude Dauguet
- 👤 Jean-Pierre Mazzone
- 👤 Pierre Moreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:11
CPC Classifications
C; C09; C09G; C09G1/00; C09G1/02; C11; C11D; C11D3/00; C11D3/0005; C11D3/0078; C11D3/02; C11D3/12; C11D3/1213
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
Polishing material, particularly for ophthalmic lenses made of organic material, consisting essentially of, by weight: 30 to 70% cerium oxide; 35 to 65% water; and 0.1 to 5% of a thickening substance; 0.1 to 3% of a surface tension reducing substance.
Claim 2
Dependent Claim
41 words
Polishing material, particularly for ophthalmic lenses made of organic material, consisting essentially of, by weight: 30 to 70% cerium oxide; 35 to 65% water; and 0.1 to 5% of a thickening substance; 0.1 to 3% of a surface tension reducing substance.
Claim 3
Dependent Claim
22 words
Polishing material according to claim 1, wherein said cerium oxide has a particle size in the range of 1 to 50 microns.
Claim 4
Dependent Claim
23 words
Polishing material according to claim 1 wherein the amount by weight of said cerium oxide generally corresponds to the amount of said water.
Claim 5
Dependent Claim
30 words
Polishing material according to claim 1 wherein the quantity of said thickening substance is such that the viscosity of said water containing said thickening agent is multiplied by about 2.5.
Claim 6
Dependent Claim
35 words
Polishing material according to claim 1, wherein the substance acting as the thickener is selected from the group consisting of: carboxymethylcellulose; ethylcellulose; methylcellulose; polyvinyl alcohol; sodium polyacrylate; methylene polyoxide; carboxypolymethylene; polyvinylpyrrolidone; casein; and gum arabic.
Claim 7
Dependent Claim
48 words
Polishing material according to claim 5 or 1, wherein the substance for reducing the surface tension is selected from the group consisting of: alkylaryl sulphonate; lauryl sulphonate; dodecyl sulphonate; dodecyl sulphate; lauryl ether sulphate; dioctyl sulphosuccinate; dihexyl sulphosuccinate; diamyl sulphosuccinate; phosphoric acid polyesters; silicones; and emulsions of polysiloxanes.
Claim 8
Dependent Claim
27 words
Polishing material according to claim 1, wherein the substance acting as thickener and the substance for reducing the surface tension are used in substantially the same proportions.
References Cited (Backward Citations)
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Cited
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US3141273A
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Cited
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Cited
US3817727A
Cited
US4071333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |