Average Co-Inventor Count = 1.11
ph-index = 10
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. Westvaco Corporation (10 from 790 patents)
2. United States Envelope Company (2 from 4 patents)
12 patents:
1. 4730767 - Letter sheet with return envelope
2. 4730768 - Remailable envelope
3. 4597591 - Envelope with concealed message window
4. 4579277 - Detachable tip-on envelope
5. 4566627 - Tamper detection envelope
6. 4487360 - Two way envelope
7. 4462538 - Door hanger envelope
8. 4294400 - Non-gusseted expansible envelope
9. 4190161 - Compartmented envelope
10. 4129214 - Two compartmented envelope
11. 3999746 - Method of making a combined brochure and return envelope package
12. 3941309 - Combined brochure and return envelope package