The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1999
Filed:
Oct. 23, 1997
Andrea M Lever, Pittsford, NY (US);
O William Lever, Jr, Pittsford, NY (US);
Other;
Abstract
The present invention is directed to method of disinfecting a contact lens with an ophthalmically safe disinfecting aqueous solution comprising about 2.0 to about 8.0 ppm of a bis(biguanide) having the following formula: ##STR1## wherein R.sup.1 and R.sup.4 are independently selected from the group consisting of branched or unbranched alkyl having 4-12 carbon atoms, ether or thioether radical having 4-12 carbon atoms, or cycloalkyl or cycloalkyl-alky radical having 5-12 carbon atoms; R.sup.2 and R.sup.3 are independently selected from the group consisting of hydrogen, alkyl having 1-12 carbon atoms, alkoxyalkyl having 1-12 carbon atoms, or cycloalkyl or cycloalkyl-alkyl having 5-12, carbon atoms; R.sup.6 and R.sup.7 are independently selected from the group consisting of hydrogen and alkyl radical having 1-6 carbon atoms, and A in the above formula is selected from the group consisting of a divalent alkyl, alkyloxyalkyl, or alkylsufide radical each having 4-12 carbon atoms. The invention is also directed to a method of cleaning and/or disinfecting a contact lens within a minimum soaking period that is not more than about 75 minutes.