Assignee
NORTHERN NATURAL GAS CO
4 granted patents·42 citations·filing 1975–1980
Top patents by PatentIndex Score
4 records- 0156US4282894APressure-operated portable siphon apparatus for removing concentrations of liquid from a gas pipelineNORTHERN NATURAL GAS CO·Filed 1979·Granted Aug 11, 1981·14 cites·5 claims
- 0246US4304104APitot heat pumpNORTHERN NATURAL GAS CO·Filed 1980·Granted Dec 8, 1981·11 cites·5 claims
- 0340US4065964APortable machine for testing protective coatingsNORTHERN NATURAL GAS CO·Filed 1977·Granted Jan 3, 1978·8 cites·10 claims
- 0430US3948744AFlush mounted corrosion electrodeNORTHERN NATURAL GAS CO·Filed 1975·Granted Apr 6, 1976·9 cites·5 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →