Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8177057 | Coin display methods and apparatus | Mark A. Krull | 2012-05-15 |
| 6859528 | Telephone call blocking system | — | 2005-02-22 |
| 6554130 | Coin display methods and apparatus | Mark A. Krull | 2003-04-29 |
| 6412626 | Coin display methods and apparatus | Mark A. Krull | 2002-07-02 |
| 6301997 | Positioning device for power-driven fastener | — | 2001-10-16 |
| 5988366 | Coin display methods and apparatus | Mark A. Krull | 1999-11-23 |
| 5125668 | Game involving toy vehicles | — | 1992-06-30 |
| 5100153 | Game using radio-controlled vehicles | — | 1992-03-31 |