1933US1896817A
Mining / Coal
Inventor file
Richard J. Heitzman
This profile groups 7 patent entries associated with Richard J. Heitzman. It does not add biographical claims beyond the cataloged patent facts.
Patents by Richard J. Heitzman
- 1935US2007568A
Mining / Coal
Blasting Plug
- 1938US2112906A
Mining / Coal
Accelerating Blasting Plug
- 1938US2115388A
Mining / Coal
Safety Blasting Plug
- 1941US2247169A
Mining / Coal
Blasting Shell for Surface Blasting
- 1946US2403386A
Mining / Coal
Blasting Plug
- 1947US2419352A