US PATENT SUBCLASS 264 / 1.8
.~.~ Including bifocal

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

1.1  DF  OPTICAL ARTICLE SHAPING OR TREATING {11}
1.7  DF  .~ Composite or multiple layer {2}
1.8.~.~ Including bifocal

DEFINITION

Classification: 264/1.8

Including bifocal:

(under subclass 1.7) Process directed to forming an optical

article having multiple nonrandom areas of uniform refractive properties which differ from each other.

(1) Note. This subclass provides for the forming of bifocals in particular and multifocal lenses in general.