Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6478181 | Shrinkable tray with attachable lids | Calvin S. Krupa, Richard T. Steichen | 2002-11-12 |
| D421695 | Vegetable container | Calvin S. Krupa | 2000-03-21 |
| D395985 | Food container | Calvin S. Krupa | 1998-07-14 |
| D395796 | Food container | Calvin S. Krupa | 1998-07-07 |
| D394807 | Chicken container | Calvin S. Krupa | 1998-06-02 |
| D391850 | Pie container | Calvin S. Krupa | 1998-03-10 |
| D385780 | Egg carton | Calvin S. Krupa | 1997-11-04 |
| D385784 | Fruit container | Calvin S. Krupa | 1997-11-04 |
| 5653345 | Fruit box | Calvin S. Krupa | 1997-08-05 |
| D380381 | Fruit container | Calvin S. Krupa | 1997-07-01 |
| D379300 | Fruit container | Calvin S. Krupa | 1997-05-20 |
| D378192 | Stackable berry container with hinged lid | Calvin S. Krupa | 1997-02-25 |
| D377450 | Stackable berry container with hinged lid | Calvin S. Krupa | 1997-01-21 |
| 5590805 | Fruit box | Calvin S. Krupa | 1997-01-07 |
| D374820 | Cake container | Calvin S. Krupa | 1996-10-22 |
| D371961 | Egg container | Calvin S. Krupa | 1996-07-23 |
| 5497894 | Clamshell container for food items | Calvin S. Krupa | 1996-03-12 |
| D365272 | Clamshell container for food items | Calvin S. Krupa | 1995-12-19 |
| D363879 | Blueberry container | Calvin S. Krupa | 1995-11-07 |
| 5456379 | Blueberry container | Calvin S. Krupa | 1995-10-10 |
| D363022 | Container for herbs | Calvin S. Krupa | 1995-10-10 |
| D361514 | Bread tray | Clavin S. Krupa | 1995-08-22 |
| D360825 | Fruit container | Calvin S. Krupa | 1995-08-01 |
| D359901 | Fruit box | Calvin S. Krupa | 1995-07-04 |
| 4917421 | Detachable fastener for electrical enclosures | David B. Wightman, Steven J. Hammond | 1990-04-17 |