Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10060158 | Rim exit device with split latch | George Frolov | 2018-08-28 |
| 8555685 | Electrically controlled door lock | George Frolov | 2013-10-15 |
| 5988708 | Electromagnetically managed latching exit bar | George Frolov, John E. Walsh, Peter S. Conklin, Gary E. Lavelle | 1999-11-23 |
| 5919006 | Tensionable cable bolt with mixing assembly | Frank Calandra, Jr., John C. Stankus, Brian R. Castle, John G. Oldsen, Kendal L. Taylor +1 more | 1999-07-06 |
| 5823582 | Electromagnetically-managed latching exit bar | George Frolov, John E. Walsh | 1998-10-20 |
| 5699572 | Combination cable spreader and cable driver | Brian R. Castle, John G. Oldsen | 1997-12-23 |
| 5560740 | Cable attachment device to spin single cables into resinous anchors in boreholes in geologic formation | Brian R. Castle | 1996-10-01 |
| RE35268 | Door security system | George Frolov, Gary E. Lavelle | 1996-06-11 |
| 5466095 | Underground support system and method of support | — | 1995-11-14 |
| 5462391 | Mine roof support cribbing system | Brian R. Castle | 1995-10-31 |
| 5417521 | Multiple cable rock anchor system | — | 1995-05-23 |
| 5288176 | Yielding grout compactor for mine roof support fixture | Brian K. Huff, Brian R. Castle | 1994-02-22 |
| 5253960 | Cable attachable device to monitor roof loads or provide a yieldable support or a rigid roof support fixture | — | 1993-10-19 |
| 5065136 | Door security system | George Frolov, Gary E. Lavelle | 1991-11-12 |
| 5013192 | Dynamic rock stabilizing fixture | — | 1991-05-07 |
| 4952080 | Automatic assist for swing-door operator | Leon Boiucaner | 1990-08-28 |
| RE32645 | Dynamic rock stabilizing fixture | — | 1988-04-12 |
| 4659258 | Dual stage dynamic rock stabilizing fixture and method of anchoring the fixture in rock formations | — | 1987-04-21 |
| 4501515 | Dynamic rock stabilizing fixture | — | 1985-02-26 |
| 4382719 | Methods of reinforcing and stabilizing an earth structure, and a stabilizer set therefor | — | 1983-05-10 |
| 4378180 | Yieldable mine roof support fixture | — | 1983-03-29 |
| 4265571 | Cable sling for support and stabilization of underground openings | — | 1981-05-05 |
| RE30256 | Friction rock stabilizers | — | 1980-04-08 |