Invention Grant
- Patent Title: Casing-head attachment
- Patent Title (中): 套管头附件
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Application No.: US12018516Application Date: 1916-09-14
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Publication No.: US1366075APublication Date: 1921-01-18
- Inventor: HEETER CHARLES M
- Applicant: HEETER CHARLES M
- Assignee: Charles M Heeter
- Current Assignee: Charles M Heeter
- Priority: US12018516 1916-09-14
- Main IPC: E21B33/04
- IPC: E21B33/04
Public/Granted literature
- US07914244B2 Fastener with zoned, varying wave-form thread Public/Granted day:2011-03-29
Information query
