Christopher Leonard Walstad has been granted 8 US patents while listed as an inventor at Microsoft . The first was granted in 2016 and the most recent in October 2025. Christopher Leonard Walstad ranks #600,572 of 4,157,543 US inventors in our database (top 14.4%). Patent records list Christopher Leonard Walstad in Seattle, WA, US.
Patents per Year Patents granted per year, 2016 to 2022 Bar chart with a peak of 2 patents in 2020. peak 2 2016: 1 patents 2016 2018: 1 patents 2018 2019: 1 patents 2019 2020: 2 patents 2020 2021: 1 patents 2021 2022: 1 patents 2022
Issued Patents All Time
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Showing 1–8 of 8 patents
Patent # Title Co-Inventors Date Approx Value ⓘ
12443699 Unlock and recovery for encrypted devices Yogesh A. Mehta , Octavian T. Ureche , Scott R. Shell , Innokentiy Basmov , Peter Novotney 2025-10-14
11295004 Unlock and recovery for encrypted devices Yogesh A. Mehta , Octavian T. Ureche , Scott R. Shell , Innokentiy Basmov , Peter Novotney 2022-04-05
$223,258,000
11153327 Data classification and access control for cloud based data Vishal Agarwal , Narendra S. Acharya , Octavian T. Ureche , Preston Derek Adam 2021-10-19
10713350 Unlock and recovery for encrypted devices Yogesh A. Mehta , Octavian T. Ureche , Scott R. Shell , Innokentiy Basmov , Peter Novotney 2020-07-14
$94,985,000
10574459 Code signing service Prabu Raju , Fengfen Liu , Levi P. Broderick , Himanshu Soni , Reed Molbak +1 more 2020-02-25
$60,478,000
10404716 Data classification and access control for cloud based data Vishal Agarwal , Narendra S. Acharya , Octavian T. Ureche , Preston Derek Adam 2019-09-03
$68,397,000
10078748 Unlock and recovery for encrypted devices Yogesh A. Mehta , Octavian T. Ureche , Scott R. Shell , Innokentiy Basmov , Peter Novotney 2018-09-18
$107,363,000
9531703 Single sign-on via application or browser Jonathan Schwartz , Karanbir Singh , Sainath Narendranath Thadkal , Aleksandr Radutskiy , Yifan Wang +2 more 2016-12-27
$44,288,000
