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For the Inventor, By the Inventor

Krefeld, Germany

Volkman Gmbh & Co.


USPTO Granted Patents = 2

Forward Citations = 4

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3 inventors (with patents filed for the assignee):

goldMedal Ingo Filz (1 out of 7 patents)

silverMedal Jurgen Kallmann (1 out of 11 patents)

bronzeMedal Phoa Tek Tjin (1 out of 1 patent)


2 patents:

1. 6035620 - Twisting spindle, especially two-for-one or direct cabling spindle (2000-03-14),
2. 5873231 - Method and device for open end spinning of yarns (1999-02-23),
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USPTO Data Jan 1 1976 - Dec 9 2025

2 Patents

#47 in

#10,552 in Germany

...
Krefeld, Germany

Volkman Gmbh & Co.

Forward Citations = 4

3 inventors:

goldMedal Ingo Filz (1 out of 7 patents)

silverMedal Jurgen Kallmann (1 out of 11 patents)

bronzeMedal Phoa Tek Tjin (1 out of 1 patent)

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