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Dupage Policy Journal

Sunday, August 24, 2025

Which patent granted in Addison in week ending Aug. 28 took the longest?

The longest time between a patent being filed and granted in the week ending Aug. 28 in Addison was 1,153 days, according to the United States Patent and Trademark Office.

The patent application was filed by Sandisk Technologies, LLC for a non-volatile memory with multi-plane mixed sub-block programming. It was filed on June 28, 2018 before being approved on Aug. 24, 2021.

Though patents are required for inventions and products, the granting of a patent is not a guarantee for success. Dennis Crouch, co-director of the Center for Intellectual Property & Entrepreneurship said roughly 50 percent of patents expire prematurely due to costs.

There were seven patents granted for Addison inventors in the week ending Aug. 28.

Longest patent application period in Addison for week ending Aug. 28
Applicant NameFiling DateGranted Date
Sandisk Technologies, LLC2019-12-172021-08-24
Peter Stevens2019-03-142021-08-24
Sandisk Technologies, LLC2018-06-282021-08-24
Sandisk Technologies, LLC2018-12-182021-08-24
Sandisk Technologies, LLC2019-12-112021-08-24
Sandisk Technologies, LLC2020-02-192021-08-24
Sandisk Technologies, LLC2020-06-092021-08-24

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