Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4957405 | Apparatus for mining | Margaret A. Roberts | 1990-09-18 |
| 4798279 | Mine haulage method and apparatus | Richard E. Doerr, Margaret A. Roberts | 1989-01-17 |
| 4650722 | Hard faced article | William D. Forgeng, Charles M. Brown | 1987-03-17 |
| 4451508 | Hard facing of metal substrates using material containing VC and improved flux compositions therefor | — | 1984-05-29 |
| 4446196 | Hard facing composition for iron base alloy substrate using VC, W, Mo, Mn, Ni and Cu and product | — | 1984-05-01 |
| 4443255 | Hard facing of metal substrates | William D. Forgeng, Charles W. Brown | 1984-04-17 |
| 4312894 | Hard facing of metal substrates | William D. Forgeng, Charles M. Brown | 1982-01-26 |
| 4224382 | Hard facing of metal substrates | Kuldip S. Chopra | 1980-09-23 |