Douglas B. Macdonald

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Des Plaines, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Rowing exercise machine
- Patent number 7,226,397
- Issue date Jun 5, 2007
- Brunswick Corporation
- Douglas B. MacDonald
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Apparatus and method for measuring heart rate
- Patent number 5,243,993
- Issue date Sep 14, 1993
- Life Fitness
- Donald J. Alexander
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE