Inventor
PIOTROWSKI THOMAS C
US5 patents
⚠️ This page may combine multiple inventors who share the name “PIOTROWSKI THOMAS C”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PROTECTOSEAL CO
4 patentsUS6056005AMay 2, 2000
Vent valve with liquid seal
PROTECTOSEAL CO44 citations87
US6244457B1Jun 12, 2001
Gauge hatch with diaphragm and liquid seal
PROTECTOSEAL CO14 citations69
US5660204AAug 26, 1997
Tank blanketing valve
PROTECTOSEAL CO13 citations63
US6629621B1Oct 7, 2003
Gauge hatch with liquid seal
PROTECTOSEAL CO4 citations57