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For the Inventor, By the Inventor

Minneapolis, MN, United States of America

Introl Corporation


USPTO Granted Patents = 3

Forward Citations = 34

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2 inventors (with patents filed for the assignee):

goldMedal David H Bennefeld (2 out of 2 patents)

silverMedal Peter B Allard (1 out of 15 patents)


3 patents:

1. 4131841 - Battery charger with automatic change from current to voltage mode (1978-12-26),
2. 4019111 - Battery charger with automatic change from current to voltage mode (1977-04-19),
3. D243344 - Housing for fence charger (1977-02-08),
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USPTO Data Jan 1 1976 - Sep 15 2026

3 Patents

#438 in Minneapolis, MN

#1,979 in Minnesota

#73,741 in US

Minneapolis, MN (US)
Minneapolis, MN, United States of America

Introl Corporation

Forward Citations = 34

2 inventors:

goldMedal David H Bennefeld (2 out of 2 patents)

silverMedal Peter B Allard (1 out of 15 patents)

Please report any incorrect information to [email protected]
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