Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8347955 | Plunger lift mechanism | Amy C. Stephens | 2013-01-08 |
| 5015118 | Mounting means | Christopher K. B. Sewell, Margaret I. Sewell, Charles P. B. Sewell | 1991-05-14 |
| 4858351 | Wall securement system | Charles P. B. Sewell, Margaret I. Sewell | 1989-08-22 |
| 4739836 | Arrangement for use in surface treatment | Stephen C. B. Sewell, Christopher K. B. Sewell, Charles P. B. Sewell, Margaret I. Sewell | 1988-04-26 |