Inventor · disambiguated record
Norman H. Still
Also filed as: BERRY ROBERT W JR · STILL NORMAN H
4 granted patents·28 citations·filing 1977–1977
73Inventor score
Technology areasE21B
Top patents by PatentIndex Score
4 records- 0140US4083416ACollapsible cutterhead for drilling upwardSMITH INTERNATIONAL·Filed 1977·Granted Apr 11, 1978·10 cites·8 claims
- 0234US4179001AUnderground drilling and casing method and apparatusBERRY ROBERT W JR·Filed 1977·Granted Dec 18, 1979·9 cites·19 claims
- 0334US4133398ACollapsible spider for use in supporting casing during upward drilling operationsSMITH INTERNATIONAL·Filed 1977·Granted Jan 9, 1979·7 cites·8 claims
- 0428US4098544ASki-type stabilizer for drilling apparatus, and method of useSMITH INTERNATIONAL·Filed 1977·Granted Jul 4, 1978·2 cites·8 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →