Assignee

BERGEY MICHAEL J

US·2 granted patents·47 citations·filing 1991–1991

Technology mixE03F2 F16L2 E03C1 E21B1 Y10S1 Y10T1

Top patents by PatentIndex Score

2 records

0155US5076730AEarth duct tunnel enlargement apparatus and methodBERGEY MICHAEL J·Filed 1991·Granted Dec 31, 1991·30 cites·6 claims
0239US5108227ATelescoping frostproofing sleeve expandable to frost depths of areaBERGEY MICHAEL J·Filed 1991·Granted Apr 28, 1992·17 cites·13 claims

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