Inventor
Richard M. Ludwig
Inventor
Columbiana, OH, US
Overview
Patents· 2 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
F23Dprimary
F23DBurners20%
F24CDomestic stoves or ranges20%
F28DHeat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do not come into direct contact20%
F28FDetails of heat-exchange and heat-transfer apparatus, of general application20%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests20%
Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1998Patents assigned to AAON INC (1)· patent assignee history
1998Based in Tulsa, OK, US· patent location history
2002Patents assigned to R & R HOLDINGS INC (1)· patent assignee history
2002Based in Columbiana, OH, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| AAON INC | 1 | 1998 |
| R & R HOLDINGS INC | 1 | 2002 |
Locations
| Location | Patents | Span |
|---|---|---|
| Columbiana, OH, US | 1 | 2002 |
| Tulsa, OK, US | 1 | 1998 |