Inventor

GRADWOHL JONALD R

3 patents

⚠️ This page may combine multiple inventors who share the name “GRADWOHL JONALD R”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

GRADWOHL DONALD R

2 patents

US4227709AOct 14, 1980

Convertible hand truck-wagon

GRADWOHL DONALD R47 citations85

US8011876B2Sep 6, 2011

Wind driven power generator

GRADWOHL DONALD R15 citations76

HEWLETT PACKARD DEVELOPMENT CO

1 patent

US7063909B2Jun 20, 2006

Fuel-cell element stack with stress relief and methods

HEWLETT PACKARD DEVELOPMENT CO2 citations61