Demonstration tool
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Claims
The ornamental design for a demonstration tool, as shown and described.
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- Alibaba. Link: https://www.alibaba.com/product-detail/CR39-eyeglass-demo-lens_60543334591.html. Visited May 7, 2019. CR39 eyeglass demo lens. (Year: 2019).
Type: Grant
Filed: Mar 14, 2018
Date of Patent: Sep 10, 2019
Assignee: Carl Zeiss Vision International GmbH (Aalen)
Inventor: Seo Ji Ye (Anyangsi)
Primary Examiner: Susan Bennett Hattan
Assistant Examiner: Lauren D McVey
Application Number: 29/640,450