Demonstration tool
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The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
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