Assignee
HELLMAN JR ROBERT R
3 granted patents·22 citations·filing 1991–1993
Top patents by PatentIndex Score
3 records- 0145US5318154AColumn for load lifting devicesHELLMAN JR ROBERT R·Filed 1992·Granted Jun 7, 1994·13 cites·12 claims
- 0235US5350338AVault ventilator systemHELLMAN JR ROBERT R·Filed 1993·Granted Sep 27, 1994·7 cites·3 claims
- 0329US5194039APersonnel safety system for vaultsHELLMAN JR ROBERT R·Filed 1991·Granted Mar 16, 1993·2 cites·7 claims
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