T.D. WILLIAMSON
18Patents
0Active
18Granted
33Portfolio score
Filing activity: Jul 19, 1974 → Apr 9, 1987
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4693278A | Safety closure member | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US4413370A | Unitary pig for use in a pipeline | Performing Operations; Transporting | 30 | Expired |
| US4387740A | Cam-flange | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4953412A | Pipeline caliper pig | Physics | 28 | Expired |
| US4515287A | Pressure activated closure lock | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US4720884A | Cleaning pig with debris flushing action | Performing Operations; Transporting | 24 | Expired |
| US4237936A | Pig trap closure | Physics | 22 | Expired |
| US4411459A | Branch fitting for providing access to the interior of a pipe | Emerging Cross-Sectional Technologies | 21 | Expired |
| US3940855A | Pipeline pig | Physics | 17 | Expired |
| US4466550A | Closure for a cylindrical opening having improved venting means | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US4579484A | Underwater tapping machine | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4457073A | Pipeline pig having improved means of sensing changes in the internal configuration of a pipeline | Physics | 15 | Expired |
| US4609209A | Precise alignment adapter flange | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4522063A | Methods and apparatus for indicating selected physical parameters in a pipeline | Physics | 11 | Expired |
| US4780962A | Pipeline bend verification pig | Physics | 8 | Expired |
| US4797239A | Foam pig with textured surface | Performing Operations; Transporting | 8 | Expired |
| US4596204A | Flag-type pig-sig | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US4058142A | Pipeline fitting | Mechanical Engineering; Lighting; Heating | 5 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.