Individual holder
LANGFIELD EDWARD R
US·4 granted patents·35 citations·filing 1977–1979
Individually held — no corporate assignee on record.
Technology mixE21C4
Top patents by PatentIndex Score
4 records- 0172US4215901AHydraulically actuated tool for mechanically splitting rock-like materialLANGFIELD EDWARD R·Filed 1978·Granted Aug 5, 1980·19 cites·8 claims
- 0257US4114951AHydraulically actuated tool for mechanically splitting rock-like materialLANGFIELD EDWARD R·Filed 1977·Granted Sep 19, 1978·10 cites·35 claims
- 0337US4168862AWear or thrust plates for hydraulic rock splitting apparatusLANGFIELD EDWARD R·Filed 1978·Granted Sep 25, 1979·4 cites·7 claims
- 0428US4252375AWear or thrust plates for hydraulic rock splitting apparatusLANGFIELD EDWARD R·Filed 1979·Granted Feb 24, 1981·2 cites·10 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →