Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10047562 | Horizontal directional drilling tool with return flow and method of using same | — | 2018-08-14 |
| 9534705 | Method and portable apparatus for thrusting a pipe into and out of an earthen formation | — | 2017-01-03 |
| 8998537 | Method and portable apparatus for forcing a pipeline into or out of a borehole | — | 2015-04-07 |
| 8628273 | Method and apparatus for forcing a pipeline into or out of a borehole | — | 2014-01-14 |
| 5456552 | Method and apparatus for installing pipe in horizontal borehole | — | 1995-10-10 |
| 5375669 | Method and apparatus for cleaning a borehole | — | 1994-12-27 |
| 5375945 | Method and apparatus for thrusting a pipeline into bore hole | — | 1994-12-27 |
| 5351764 | Method and apparatus for enlarging an underground path | — | 1994-10-04 |
| 5269384 | Method and apparatus for cleaning a bore hole | — | 1993-12-14 |
| 5230388 | Method and apparatus for cleaning a bore hole using a rotary pump | — | 1993-07-27 |
| 5209605 | Gravel-packed pipeline and method and apparatus for installation thereof | — | 1993-05-11 |
| 5096002 | Method and apparatus for enlarging an underground path | — | 1992-03-17 |
| RE33793 | Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein | William D. Cherrington | 1992-01-14 |
| 4899835 | Jet bit with onboard deviation means | — | 1990-02-13 |
| 4785885 | Method and apparatus for cementing a production conduit within an underground arcuate bore | William D. Cherrington | 1988-11-22 |
| 4784230 | Apparatus and method for installing a conduit within an arcuate bore | William D. Cherrington | 1988-11-15 |
| 4679637 | Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein | William D. Cherrington | 1987-07-14 |
| 4618008 | Vertical drilling method and apparatus | — | 1986-10-21 |
| RE32267 | Process for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein | — | 1986-10-21 |
| 4402372 | Apparatus for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein | — | 1983-09-06 |
| 4401170 | Apparatus for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein | — | 1983-08-30 |
| 4221503 | Drilling method and apparatus for large diameter pipe | — | 1980-09-09 |