Patent Explorer
Browse, filter, and analyze 4 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2610689A | Wellhead seal | OIL CENTER TOOL CO | Expired / Lapsed | 1946-08-19 | 1952-09-16 | 1966-08-19 | 0.0 yrs | 0 | |
| US2540455A | Hydraulic packer setting assembly | OIL CENTER TOOL CO | Expired / Lapsed | 1946-06-27 | 1951-02-06 | 1966-06-27 | 0.0 yrs | 0 | |
| US2456081A | Well-head seal | OIL CENTER TOOL CO | Expired / Lapsed | 1945-11-02 | 1948-12-14 | 1965-11-02 | 0.0 yrs | 0 | |
| US2426743A | Circulating well head | OIL CENTER TOOL CO | Expired / Lapsed | 1943-06-24 | 1947-09-02 | 1963-06-24 | 0.0 yrs | 0 |