Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6365646 | Method to improve humidity resistance of phenolic urethane foundry binders | Robert A. Laitar, Brian K. Teeter, Leonid S. Zaretskiy | 2002-04-02 |
| 6299677 | Binders for cores and molds | Calvin K. Johnson, Leonid S. Zaretskiy, Brian Algar | 2001-10-09 |
| 6139619 | Binders for cores and molds | Leonid S. Zaretskiy, Robert Manning | 2000-10-31 |
| 5916933 | Bisphenol-containing resin coating articles and methods of using same | Calvin K. Johnson | 1999-06-29 |
| 5639806 | Bisphenol-containing resin coating articles and methods of using same | Calvin K. Johnson | 1997-06-17 |
| 5218038 | Phenolic resin coated proppants with reduced hydraulic fluid interaction | Calvin R. Johnson, Charles J. Korpics | 1993-06-08 |
| 4996249 | Method to improve flowability of resin coated sand | Calvin K. Johnson, Richard Cooke | 1991-02-26 |
| 4971132 | Alkaline phenolic resole resin binders | David R. Armbruster | 1990-11-20 |
| 4929648 | Alkaline phenolic resole resin binders | David R. Armbruster | 1990-05-29 |