Patent · US Expired

Marking of lenses

US4219721A · kind A · utility

54Cited by
9References
1Claims
0Family size

Assignee

Inventors

Key dates

Filing dateAug 23, 1978
Grant dateAug 26, 1980
Priority date—
Expiry dateAug 23, 1998

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S269/909
  • WIPO fieldOther special machines
  • WIPO sectorMechanical engineering

Abstract

A laser beam is used to provide rapid, clear and permanent marking of plastic lenses.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.