Patent US5017238A successfully refreshed from Google Patents.
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 21:09
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.
References Cited (Backward Citations)
US2809943A
Cited
US3637535A
Cited
US4224415A
Cited
US4224415B1
Cited
US3509078A
Cited
US3418262A
Cited
US3518341A
Cited
US3583957A
Cited
US3627708A
Cited
US3767600A
Cited
USRE27026E
Cited
US3989649A
Cited
US4011388A
Cited
US4026826A
Cited
DE2608533A1
Cited
US4046706A
Cited
US4259462A
Cited
US4208309A
Cited
US4724240A
Cited
CA1168157A
Cited
US4661327A
Cited
US4655957A
Cited
US4690825A
Cited
EP0252463A2
Cited
WO1988001164A1
Cited
US4806360A
Cited
US4962170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 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 |