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:
Apr. 06, 1982
Filed:
Nov. 15, 1979
Peter Dawson, Bingley, GB;
John H Phillips, Cheadle Hulme, GB;
Kelvin Lenses Limited, Denton, GB;
Abstract
In order to measure, for example, the radius of curvature of a soft contact lens, the lens is mounted in a bath of the electrolyte and supported at its periphery on a tubular support. A probe movable along an axis has two electrodes mounted on it and the resistance or impedance between those electrodes and the mount is monitored; when the difference in these resistances or impedances equals a predetermined value, the probe is taken as being a predetermined distance from the lens and the position of the probe relative to the mount is measured by a transducer arrangement. The output from the transducer is converted to digital form and used to address a read-only-memory in which are stored values correlating the position of the probe along the axis with the radius of curvature of the lens.