US4836986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disinfecting and preserving systems and methods of use
Assignee: Bausch and Lomb Inc
•
Filing: 1988-08-08
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Granted: 1989-06-06
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Expires: 2008-08-08
Abstract
Abstract A method of treating a contact lens wherein the lens is contacted with a solution containing a biguanide or water-soluble salt thereof, in combination with a borate buffer system, said biguanide having the formula: ##STR1## wherein n is from 1 to 500, said biguanide being present in an amount from 0.000001 to 0.0003 weight percent.
Inventors
- 👤 Lai Ogunbiyi
- 👤 Francis X. Smith
- 👤 Thomas M. Riedhammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:36
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/3703; C11D3/3723; A; A01; A01N; A01N47/00; A01N47/40; A01N47/42; A01N47/44; A61; A61L; A61L12/00; A61L12/08; A61L12/14; A61L12/141; A61L12/142; C11D3/0005; C11D3/0078; C11D3/48
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
A method of treating a contact lens which comprises treating the lens with a solution comprising a microbiocidally or fungicidally effective amount of a biguanide or water-soluble salt thereof, in combination with a borate buffer system, said biguanide having the formula: ##STR10## wherein n is from 1 to 500, said biguanide being present in an amount from 0.000001 to 0.0003 weight percent.
Claim 2
Independent Claim
62 words
A method of treating a contact lens which comprises treating the lens with a solution comprising a microbiocidally or fungicidally effective amount of a biguanide or water-soluble salt thereof, in combination with a borate buffer system, said biguanide having the formula: ##STR10## wherein n is from 1 to 500, said biguanide being present in an amount from 0.000001 to 0.0003 weight percent.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the biguanide is a water-soluble salt of polyhexamethylene biguanide.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein the biguanide is a polymer having molecular weights under 100,000.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein the biguanide is a polymer having molecular weights in the range from 1,000 to 50,000.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein n of the biguanide polymer averages between 2 and 12.
Claim 7
Dependent Claim
12 words
The method of claim 2 wherein n averages from 4 to 7.
Claim 8
Dependent Claim
18 words
The method of claim 2 wherein the solution contains at least 0.00001 weight percent of the biguanide polymer.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein the solution contains about 0.0001 to about 0.0003 weight percent of the biguanide polymer.
Claim 10
Dependent Claim
40 words
The method of claim 1 wherein the solution is an aqueous solution for contact lens care and contains additionally at least one component from the group consisting of amphoteric, nonionic and cationic surfactants, tonicity agents, sequestering agents and viscosity builders.
Claim 11
Dependent Claim
40 words
The method of claim 1 wherein the solution is an aqueous solution for disinfecting contact lenses and contains additionally at least one component from the group consisting of amphoteric, nonionic and cationic surfactants, tonicity agents, sequestering agents and viscosity builders.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein the contact lens is a hydrogel contact lens.
Claim 13
Dependent Claim
16 words
The method of claim 1 wherein the contact lens is a rigid gas permeable contact lens.
References Cited (Backward Citations)
US2336605A
Cited
US4022834A
Cited
GB1432345A
Cited
US3860729A
Cited
US4405645A
Cited
US4499077A
Cited
FR2517208A1
Cited
US4519803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |