For the Inventor, By the Inventor

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St. Petersburg, Russia

Uma Ltd.

USPTO Granted Patents = 2

Forward Citations = 22

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6 inventors (with patents filed for the assignee):

Norbert Hessbrüggen (1 out of 7 patents)

Piotr A Aleksandrov (1 out of 1 patent)

Vladimir S Sidorov (1 out of 1 patent)

4. Leon M Marmorstein (1 out of 1 patent)

5. Valentin T Grebennikov (1 out of 1 patent)

6. Ignaty M Petuhov (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 5337825 - Method of oil well productivity increase (1994-08-16),

2. 4616538 - Chuck assembly (1986-10-14),

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USPTO Data Jan 1 1976 - Dec 16 2025

2 Patents

#10 in St. Petersburg

#153 in Russia

St. Petersburg, Russia

Uma Ltd.

Forward Citations = 22

6 inventors:

Norbert Hessbrüggen (1 out of 7 patents)

Piotr A Aleksandrov (1 out of 1 patent)

Vladimir S Sidorov (1 out of 1 patent)

4. Leon M Marmorstein (1 out of 1 patent)

5. Valentin T Grebennikov (1 out of 1 patent)

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