Patents per Year
Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 10350393 | Checker balloon winding machine | David M. Graves, William E. Parmentier, Robert G. Lerdahl, Jo Ann Kelly | 2019-07-16 | |
| 9643235 | Checker balloon winding machine | David M. Graves, William E. Parmentier, Robert G. Lerdahl, Jo Ann Kelly | 2017-05-09 | $43,873,000 |
| 8673200 | Checker balloon winding machine | David M. Graves, William E. Parmentier, Robert G. Lerdahl, Jo Ann Kelly | 2014-03-18 | $8,945,000 |
| 8236223 | Checker balloon winding machine | David M. Graves, William E. Parmentier, Robert G. Lerdahl, Jo Ann Kelly | 2012-08-07 | $16,398,000 |