John Christianson
25Patents
8h-index
14Co-inventors
72Inventor score
Filing activity: Nov 29, 1989 → Nov 8, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5067709A | Unassisted lower torso strengthening and stretching device | Emerging Cross-Sectional Technologies | 39 | Expired |
| USD628914S1 | Torpedo level | General | 19 | Expired |
| US7832112B2 | Vial-mounting structure | Physics | 18 | Active |
| US8291605B2 | Box level | Emerging Cross-Sectional Technologies | 16 | Active |
| US8413342B2 | Level with a magnet-mounting structure | Physics | 16 | Active |
| US9909870B2 | Level including removable end caps | Physics | 11 | Active |
| USD623544S1 | Box level | General | 11 | Expired |
| US6722303B2 | Fairlead and cam assembly | Performing Operations; Transporting | 10 | Expired |
| US8011109B2 | Casing mount for a cylindrical vial | Physics | 5 | Active |
| US11346664B2 | Level including removable end caps | Physics | 4 | Active |
| US8375591B2 | Box level | Emerging Cross-Sectional Technologies | 4 | Active |
| US9347774B2 | Angular indicator tool | Physics | 4 | Active |
| US10823561B2 | Vial with improved visibility for level | Physics | 4 | Active |
| US10281274B2 | Level and level-straightedge system | Physics | 3 | Active |
| US8291604B2 | Box level | Emerging Cross-Sectional Technologies | 3 | Active |
| USD723954S1 | Angular indicator tool | General | 3 | Active |
| US10697770B2 | Level including removable end caps | Physics | 3 | Active |
| US8745885B2 | Box level | Emerging Cross-Sectional Technologies | 2 | Active |
| USD887874S1 | Framing square | General | 1 | Active |
| USD866359S1 | Framing square | General | 1 | Active |
| US11740082B2 | Level including removable end caps | Physics | 1 | Active |
| USD618120S1 | Side brace for central-vial region of a box level | General | 1 | Expired |
| US11506491B2 | Vial with improved visibility for level | Physics | 1 | Active |
| US12031845B2 | Vial with improved visibility for level | Physics | 0 | Active |
| US6520103B2 | Boom vang for sailing vessel | Performing Operations; Transporting | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.