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. 31, 1978
Filed:
Nov. 12, 1976
Howard E Chace, Southbridge, MA (US);
Anthony F Szwarc, Sturbridge, MA (US);
American Optical Corporation, Southbridge, MA (US);
Abstract
Apparatus for measuring the refractive powers of a lens and displaying the measured powers in so-called prescription form. A focimeter is equipped with means for generating electrical signals indicative of the net refractive powers of the lens, which signals are extended to novel electronic logic and control means for ultimately reading out and/or displaying the lens powers in a prescription form having 'sphere' and 'cylinder' components of power. Selectively activable control means determine whether the prescription is displayed in so-called '+ cylinder' notation or '- cylinder' notation. Additional means are provided for indicating which of two possible axis angles is correctly associated with the particular displayed component of cylinder power.