TDW Delaware, Inc.
121Patents
73Active
121Granted
51Portfolio score
Filing activity: Mar 25, 1988 → Jan 16, 2024 · 26 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5460046A | Method and apparatus for ultrasonic pipeline inspection | Physics | 59 | Expired |
| US5612499A | Method of inserting a sensor into a pipeline | Emerging Cross-Sectional Technologies | 53 | Expired |
| US5450765A | Apparatus for providing signal communication between the interior and exterior of a pipeline | Mechanical Engineering; Lighting; Heating | 50 | Expired |
| US6847207B1 | ID-OD discrimination sensor concept for a magnetic flux leakage inspection tool | Physics | 47 | Expired |
| US7352463B2 | Method and device for detecting gases by absorption spectroscopy | Physics | 44 | Expired |
| US6286553A | Removable closure system | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US5360300A | Cutter shell | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5464496A | Plastic pipe butt fusion machine | Emerging Cross-Sectional Technologies | 31 | Expired |
| US5417112A | Apparatus for indicating the passage of a pig moving within an underground pipeline | Physics | 28 | Expired |
| US5384929A | Pig for use in cleaning the interior wall of a pipeline | Performing Operations; Transporting | 26 | Expired |
| US6116285A | Removable threaded plug | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5843271A | Plastic pipe butt fusion machine and cart assembly | Emerging Cross-Sectional Technologies | 20 | Expired |
| US5295279A | Cup for use on a pipeline | Performing Operations; Transporting | 19 | Expired |
| US5439331A | High pressure tapping apparatus | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4825498A | Cleaning pig with selectable debris flushing action | Performing Operations; Transporting | 18 | Expired |
| US4984322A | Elastomeric disc for use on a pipeline pig | Performing Operations; Transporting | 18 | Expired |
| US4867024A | Locking rotary die cutting cover | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5770006A | Butt fusion machine for manufacturing full size segemented pipe turns | Performing Operations; Transporting | 17 | Expired |
| US5577776A | Tee fitting for lined pipe | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US6067682A | Cup or disc for use as a part of a pipeline pig | Performing Operations; Transporting | 16 | Expired |
| US5466099A | Cutter shell for forming holes of improved cylindricality | Emerging Cross-Sectional Technologies | 16 | Expired |
| US8307856B2 | Double block and bleed plug | Emerging Cross-Sectional Technologies | 15 | Active |
| US7546847B2 | Locking plug for closing the sidewall of a pipe | Emerging Cross-Sectional Technologies | 15 | Active |
| US5088336A | Pipeline caliper pig | Physics | 15 | Expired |
| US7841364B2 | Double block and bleed plug | Emerging Cross-Sectional Technologies | 14 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.