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Ankeny, IA, United States of America

John R Durfee

Average Co-Inventor Count = 2.77

ph-index = 3

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 34

John R DurfeeDavid G Stephenson (2 patents)John R DurfeeC Austin Greider (1 patent)John R DurfeeHarlan J Trefz (1 patent)John R DurfeeC Austin Grieder (1 patent)John R DurfeeTerry R Lee (1 patent)John R DurfeeJohn R Durfee (3 patents)David G StephensonDavid G Stephenson (2 patents)C Austin GreiderC Austin Greider (6 patents)Harlan J TrefzHarlan J Trefz (2 patents)C Austin GriederC Austin Grieder (1 patent)Terry R LeeTerry R Lee (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Western International, Inc. (2 from 4 patents)

2. Noma Outdoor Products Inc. (1 from 9 patents)


3 patents:

1. D311008 - Lawn mower body

2. 4776405 - Rotary driven cultivator with support arm between clutch casing and gear

3. 4648238 - Removable grass catcher

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as of
1/2/2026
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