Inventor
David Holdman
Inventor
Kingwood, TX, US
Overview
Patents· 1 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
E21Bprimary
E21BEarth or rock drilling100%
Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2019Patents assigned to APS TECH INC (1)· patent assignee history
2019Based in Kingwood, TX, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| APS TECH INC | 1 | 2019 |
Locations
| Location | Patents | Span |
|---|---|---|
| Kingwood, Texas, US | 1 | 2019 |