Average Co-Inventor Count = 1.00
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.
Company Filing History:
1. Harper Truck, Inc. (3 from 5 patents)
2. Harper Trucks, Inc. (1 from 16 patents)
4 patents:
1. 4902187 - Drum dolly attachment apparatus
2. 4860606 - Ratchet apparatus with hand truck assembly
3. D278373 - Hand truck
4. 4433816 - Wire guide and retainer assembly