Growing community of inventors

Glendale, WI, United States of America

Donald G Haffner

Average Co-Inventor Count = 2.93

ph-index = 4

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 = 65

Donald G HaffnerNeill C Woelffer (2 patents)Donald G HaffnerMerlin H Gandrud (2 patents)Donald G HaffnerAnthony J Saiia (1 patent)Donald G HaffnerFrank Allen Ecker (1 patent)Donald G HaffnerGlenn Richard Hubbard (1 patent)Donald G HaffnerHarold John Jacoby (1 patent)Donald G HaffnerNeill C Woelfer (1 patent)Donald G HaffnerDonald G Haffner (4 patents)Neill C WoelfferNeill C Woelffer (6 patents)Merlin H GandrudMerlin H Gandrud (4 patents)Anthony J SaiiaAnthony J Saiia (13 patents)Frank Allen EckerFrank Allen Ecker (2 patents)Glenn Richard HubbardGlenn Richard Hubbard (2 patents)Harold John JacobyHarold John Jacoby (1 patent)Neill C WoelferNeill C Woelfer (1 patent)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. Jacobsen Manufacturing Company (4 from 13 patents)


4 patents:

1. 4149362 - Combined lawn mower and grass catcher

2. 4149363 - Lawn mower catcher

3. D249519 - Combined lawn mower and grass catcher

4. 3992858 - Hydraulic system for controlling a gang of lawn mowers

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as of
12/13/2025
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