US5017238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous cleaning dispersions using adsorptive polymeric powder and method of using
Assignee: Certis USA LLC
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Filing: 1989-08-30
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Granted: 1991-05-21
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Expires: 2009-08-30
Abstract
Abstract An aqueous cleaning dispersion, especially suitable as a contact lens cleaning solution, which includes a homogeneous mixture of water and a liquid-adsorbable powder homopolymer of tetraethylene glycol dimethacrylate.
Inventors
- 👤 Richard C. Chromecek
- 👤 Milan F. Sojka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:53
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0008; C11D17/0013; C11D3/00; C11D3/0005; C11D3/0078; C11D3/16; C11D3/37; C11D3/3746; C11D3/3757; C11D3/3765
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
23 words
An aqueous cleaning dispersion comprising a homogeneous mixture of: (a) water and (b) a liquid-adsorbable homopolymer of tetraethylene glycol dimethacrylate in powder form.
Claim 2
Dependent Claim
23 words
An aqueous cleaning dispersion comprising a homogeneous mixture of: (a) water and (b) a liquid-adsorbable homopolymer of tetraethylene glycol dimethacrylate in powder form.
Claim 3
Dependent Claim
28 words
A dispersion as claimed in claim 1 wherein said tetraethylene glycol dimethacrylate homopolymer is employed in an amount ranging from 0.001 to 25 weight percent of said dispersion.
Claim 4
Dependent Claim
11 words
A dispersion as claimed in claim 1 further comprising a surfactant.
Claim 5
Dependent Claim
21 words
A dispersion as claimed in claim 3 wherein said surfactant is employed from 0.1 to 10 weight percent of said dispersion.
Claim 6
Dependent Claim
105 words
A dispersion as claimed in claim 1 wherein said poly(tetraethylene glycol methacrylate) powder is prepared by the steps comprising: (a) homogeneously mixing a solution comprising from 0.1 to 40 parts by weight of tetraethylene glycol dimethacrylate, from 60 to 99.9 parts by weight of a solvent, wherein the total weight of said tetraethylene glycol dimethacrylate and said solvent is 100 parts, and 0.05 to 5 weight percent initiator based on the weight of said tetraethylene glycol dimethacrylate, and (b) polymerizing said tetraethylene glycol dimethacrylate to form a polymer, wherein said solvent is a solvent for tetraethylene glycol dimethacrylate and a non-swelling non-solvent for said polymer.
Claim 7
Dependent Claim
29 words
A dispersion as claimed in claim 5 wherein said method of preparing said poly(tetraethylene glycol methacrylate) powder further comprises the step of: (c) removing said solvent from said polymer.
Claim 8
Dependent Claim
15 words
A dispersion as claimed in claim 6 wherein said monomer solvent is anhydrous isopropyl alcohol.
Claim 9
Dependent Claim
18 words
A dispersion as claimed in claim 7 wherein said isopropyl alcohol is removed by drying in anhydrous conditions.
Claim 10
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 1 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 11
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 2 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 12
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 3 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 13
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 4 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 14
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 5 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 15
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 6 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 16
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 7 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
Claim 17
Dependent Claim
35 words
A method for cleaning contact lenses comprising the steps of: (a) applying the dispersion claimed in claim 8 to a contact lens, (b) rubbing the lens with said dispersion, and, (c) thereafter, rinsing the lens.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |