Borislav J. Tchakarov
33Patents
10h-index
27Co-inventors
75Inventor score
Filing activity: Aug 16, 1993 → Apr 18, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6218662A | Downhole carbon dioxide gas analyzer | Physics | 209 | Expired |
| US6627873B2 | Down hole gas analyzer method and apparatus | Physics | 54 | Expired |
| US6484801B2 | Flexible joint for well logging instruments | Fixed Constructions | 44 | Expired |
| US6002643A | Pulser | Fixed Constructions | 37 | Expired |
| US5348091A | Self-adjusting centralizer | Fixed Constructions | 30 | Expired |
| US5660238A | Switch actuator and flow restrictor pilot valve assembly for measurement while drilling tools | Fixed Constructions | 24 | Expired |
| US5934378A | Centralizers for a downhole tool | Fixed Constructions | 18 | Expired |
| US6903553B2 | Method and apparatus for a quadrupole transmitter for directionally sensitive induction tool | Physics | 15 | Expired |
| US6937022B2 | Method and apparatus for a quadrupole transmitter for directionally sensitive induction tool | Physics | 10 | Expired |
| US7530407B2 | Rotary coring device and method for acquiring a sidewall core from an earth formation | Fixed Constructions | 10 | Active |
| US10072490B1 | Boundary tracking control module for rotary steerable systems | Fixed Constructions | 8 | Active |
| US8570045B2 | Drilling system for making LWD measurements ahead of the bit | Fixed Constructions | 8 | Active |
| US5836388A | Flexible joint for downhole tools | Fixed Constructions | 6 | Expired |
| US7411388B2 | Rotary position sensor and method for determining a position of a rotating body | Electricity | 5 | Expired |
| US8171990B2 | In-situ formation strength testing with coring | Fixed Constructions | 5 | Active |
| US9273517B2 | Downhole closed-loop geosteering methodology | Fixed Constructions | 5 | Active |
| US7373994B2 | Self cleaning coring bit | Fixed Constructions | 5 | Expired |
| US7921913B2 | Vacuum insulated dewar flask | Fixed Constructions | 5 | Expired |
| US8141419B2 | In-situ formation strength testing | Fixed Constructions | 4 | Active |
| US7673704B2 | Variable positioning deep cutting rotary coring tool with expandable bit | Fixed Constructions | 4 | Active |
| US7762328B2 | Formation testing and sampling tool including a coring device | Fixed Constructions | 3 | Active |
| US9638819B2 | Modular resistivity sensor for downhole measurement while drilling | Physics | 3 | Active |
| US9851465B2 | Apparatus and methods for communicating downhole data | Physics | 3 | Active |
| US10648319B2 | Boundary tracking control module for rotary steerable systems | Fixed Constructions | 2 | Active |
| US11326437B2 | Universal bottomhole assembly node (UBHAN) providing communications to and from rotary steerable systems (RSS) and real time azimuthal resistivity imaging for geosteering and pressure while drilling (FWD) for well control | Fixed Constructions | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.