Patents per Year
Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6857861 | Ring for concrete pump | Gary Condon, Mark T. Klingensmith | 2005-02-22 | $3,731,000 |
| 5655778 | Bellows self-threading seal | — | 1997-08-12 | $986,000 |
| 5415531 | Piston pump for fluent materials | — | 1995-05-16 | $328,000 |
| 5351887 | Pumping and spraying system for heavy materials | Robert D. Heterington, Gary D. Cavanaugh | 1994-10-04 | $268,000 |
| 5094596 | High pressure piston pump for fluent materials | Larry Erwin, Robert D. Hetherington | 1992-03-10 | $378,000 |
| 4791946 | Alternating selectable cleaning fluid to air purging system | Robert D. Hetherington | 1988-12-20 | $348,000 |
| 4770117 | Fiberglass reinforce product spray gun with roving cutter steering mechanism | Robert D. Hetherington | 1988-09-13 | $544,000 |
| 4690308 | Pail mount pump with integral cover | Larry Erwin, Robert D. Hetherington | 1987-09-01 | $521,000 |
| 4516725 | Dual component pumping system | Robert D. Hetherington, Thomas A. Parmley | 1985-05-14 | $285,000 |