Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10030350 | Manhole frame with one or more handholds | — | 2018-07-24 |
| 10030351 | Manhole frame with one or more handholds | — | 2018-07-24 |
| 10030352 | Manhole frame with one or more handholds | — | 2018-07-24 |
| 9845586 | Manhole frame with one or more handholds | — | 2017-12-19 |
| 6892743 | Modular greenhouse | Sheila Mary Armstrong | 2005-05-17 |
| 5634739 | Manhole casting positioning apparatus and method | — | 1997-06-03 |
| 4666333 | Manhole casting positioning apparatus | — | 1987-05-19 |