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. 20, 2020
Filed:
Aug. 23, 2018
Novartis Ag, Basel, CH;
Justyna Justynska-Reimann, Aschaffenburg, DE;
Markus Grebe, Einhausen, DE;
Michael Ruland, Dossenheim, DE;
André Wicklein, Aschaffenburg, DE;
Alcon Inc., Fribourg, CH;
Abstract
The present invention relates to a method and an apparatus () for determining a coefficient of friction at a test site () on a surface () of a contact lens (). The apparatus comprises: a lens holder () arranged at least partially in a receptacle (); a slide () comprising a counter surface () made of lapped aluminum for contacting the test site (); a load generator () configured to apply a predetermined normal load (Fn) between the counter surface () and the test site; a drive () configured to generate a sliding movement between the counter surface () and the contact lens in direction located in a plane perpendicular to the normal load (Fn); and a force sensor () configured to measure a tangential frictional force (Ft) between the test site and the counter surface () along the direction of the sliding movement.