Davis-Lynch, Inc.
19Patents
1Active
19Granted
30Portfolio score
Filing activity: Jan 12, 1978 → Jul 2, 2008 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5584343A | Method and apparatus for filling and circulating fluid in a wellbore during casing running operations | Fixed Constructions | 150 | Expired |
| US5566772A | Telescoping casing joint for landing a casting string in a well bore | Fixed Constructions | 125 | Expired |
| US5234052A | Cementing apparatus | Fixed Constructions | 117 | Expired |
| US5024273A | Cementing apparatus and method | Fixed Constructions | 102 | Expired |
| US5842517A | Anti-rotational cementing apparatus | Fixed Constructions | 68 | Expired |
| US4892144A | Inflatable tools | Fixed Constructions | 58 | Expired |
| US6679336B2 | Multi-purpose float equipment and method | Fixed Constructions | 56 | Expired |
| US5411095A | Apparatus for cementing a casing string | Fixed Constructions | 56 | Expired |
| US5085273A | Casing lined oil or gas well | Fixed Constructions | 44 | Expired |
| US5027894A | Through the tubing bridge plug | Fixed Constructions | 34 | Expired |
| US6401811B1 | Tool tie-down | Fixed Constructions | 33 | Expired |
| US5150756A | Well completion apparatus | Fixed Constructions | 27 | Expired |
| US6401824B1 | Well completion convertible float shoe/collar | Fixed Constructions | 24 | Expired |
| US5197542A | Well packer | Fixed Constructions | 24 | Expired |
| US4909322A | Casing centralizer | Fixed Constructions | 22 | Expired |
| US4171019A | Apparatus and method for re-entering and cementing an underwater well | Fixed Constructions | 17 | Expired |
| US6439304B2 | Stand-off device | Fixed Constructions | 12 | Expired |
| US7849918B2 | Centering structure for tubular member and method of making same | Fixed Constructions | 11 | Active |
| US6562401B2 | Method for making a stand-off device to prevent an oilfield tubular from contacting the side of the wellbore | Fixed Constructions | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.