US4863627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning and/or disinfection of contact lenses
Assignee: University of Bath
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Filing: 1986-03-24
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Granted: 1989-09-05
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Expires: 2006-03-24
Abstract
Abstract PCT No. PCT/GB86/00168 Sec. 371 Date Dec. 9, 1986 Sec. 102(e) Date Dec. 9, 1986 PCT Filed Mar. 24, 1986 PCT Pub. No. WO86/05695 PCT Pub. Date Oct. 9, 1986.A contact lens disinfecting composition in solid form for addition to water comprises a contact lens disinfecting agent which is a source of hydrogen peroxide when in water, such as sodium percarbonate; an inactivating agent in delayed-release form such as sodium thiosulphate; and a color change indicator.
Inventors
- 👤 David J. G. Davies
- 👤 Brian J. Meakin
- 👤 John E. Rees
- 👤 John N. Staniforth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:33
CPC Classifications
A; A61; A61L; A61L12/00; A61L12/08; A61L12/12; A61L12/124
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A contact lens disinfecting composition in solid form for addition to water comprising a contact lens disinfecting agent which is capable of serving as a source of hydrogen peroxide when in water, an inactivating agent capable of rendering the disinfecting agent ophthalmically acceptable, which inactivating agent is in delayed release form, and at least 0.0001 percent by weight of the working solution of an ophthalmically acceptable colour change indicator such that in use, upon inactivation of the disinfecting agent by the inactivating agent, a visible colour change from coloured to colourless occurs, the composition upon dissolution in pure water yields an ophthalmically acceptable, non-irritating final solution having a pH of from 6 to 8.
Claim 2
Dependent Claim
114 words
A contact lens disinfecting composition in solid form for addition to water comprising a contact lens disinfecting agent which is capable of serving as a source of hydrogen peroxide when in water, an inactivating agent capable of rendering the disinfecting agent ophthalmically acceptable, which inactivating agent is in delayed release form, and at least 0.0001 percent by weight of the working solution of an ophthalmically acceptable colour change indicator such that in use, upon inactivation of the disinfecting agent by the inactivating agent, a visible colour change from coloured to colourless occurs, the composition upon dissolution in pure water yields an ophthalmically acceptable, non-irritating final solution having a pH of from 6 to 8.
Claim 3
Dependent Claim
21 words
A composition as claimed in claim 1 wherein the colour change indicator is a redox indicator or an acid base indicator.
Claim 4
Dependent Claim
36 words
A composition as claimed in claim 2 wherein the disinfecting agent is basic and inactivation thereof is associated with a fall in pH, and wherein the indicator is an acid/base indicator responsive to said pH change.
Claim 5
Dependent Claim
12 words
A composition as claimed in claim 3 wherein said indicator is phenolphthalein.
Claim 6
Dependent Claim
21 words
A composition as claimed in claim 1 wherein the disinfecting agent is an organic hyroperoxidate, and organic peroxide or a peroxyacid.
Claim 7
Dependent Claim
16 words
A composition as claimed in claim 1 wherein the inactivating agent is a sulphrus acid derivative.
Claim 8
Dependent Claim
26 words
A composition as claimed in claim 1 containing a sequestering agents selected from the group consisting of sequestering agents for calcium ions and for magnesium ions.
Claim 9
Dependent Claim
28 words
A composition as claimed in claim 1 in the form of a tablet having a delayed release core of inactivating agent and the disinfecting agent outside the core.
Claim 10
Dependent Claim
27 words
A composition as claimed in claim 1 in tablet capsule, granules, powder, or pellet form containing particles of disinfecting agent and delayed release particles of inactivating agent.
Claim 11
Dependent Claim
54 words
A method for disinfecting a contact lens comprising contacting the lens with water containing a composition as claimed in claim 1 and allowing the disinfecting agent to disinfect the lens and the inactivating agent to be released and to render the remaining disinfecting agent ophthalmically acceptable so as to provide said visible colour change.
Claim 12
Dependent Claim
11 words
A composition as claimed in claim 1 containing a dechlorinating agent.
Claim 13
Dependent Claim
25 words
A composition as claimed in claim 1, which on dissolution in pure water yields a final solution having a pH of from 6 to 7.5.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |