High strength ophthalmic lens

Details High strength ophthalmic lens High strength ophthalmic lens

C - Chemistry, Metallurgy

03

C

88/38, 49/92

C03C 21/00 (2006.01) C03C 3/097 (2006.01)

Patent

CA 1090580

HIGH STRENGTH OPHTHALMIC LENS Abstract of the Disclosure An ophthalmic glass lens having a compressively- stressed surface zone after ion exchanging which is at least 120 microns in depth, formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide and about 3 to about 15 percent potassium oxide. There is a compressively- stressed surface layer having a strength of at least 25,000 psi. The total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent. The total amount of zinc oxide, lanthanum oxide, magnesium oxide, and calcium oxide is about 8 to 15 percent, and these is about 3 to about 15 percent phosphorus pentoxide. An ion exchange process takes place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

271752

Affiliated with

Also associated with

Rating

High strength ophthalmic lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High strength ophthalmic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High strength ophthalmic lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-682519