Issued Patents All Time
Showing 26–41 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4712255 | Portable toilet with valve actuating handle that automatically locks the valve in closed position during emptying of the holding tank | John R. Selina | 1987-12-15 |
| 4703785 | Tank fill assist | John R. Selina | 1987-11-03 |
| 4641383 | Portable toilet holding tank spout | Charles L. Sargent, John A. Hoffman, John T. Cameron | 1987-02-10 |
| 4570273 | Portable toilet pourspout | John R. Selina | 1986-02-18 |
| 4547916 | Magnetically actuated level indicator | Arthur W. Henke | 1985-10-22 |
| 4462124 | Flush apparatus for water closet and method of operation | Richard G. Lapham, Charles L. Sargent, Frank T. Sargent | 1984-07-31 |
| 4305164 | Portable toilet facility | Frank T. Sargent, Charles L. Sargent, James T. Embach | 1981-12-15 |
| D262050 | Portable toilet | Arthur W. Henke, Erin J. Lindsay | 1981-11-24 |
| D262051 | Portable toilet | Charles L. Sargent, John A. Hoffman | 1981-11-24 |
| D257385 | Toilet | Frank T. Sargent, Arthur W. Henke, John A. Hoffman | 1980-10-14 |
| 4217668 | Portable toilet | Charles L. Sargent, John A. Hoffman, Arthur W. Henke | 1980-08-19 |
| 4215445 | Portable toilets | Arthur W. Henke, Erin J. Lindsay, James T. Embach | 1980-08-05 |
| D255597 | Toilet | Frank T. Sargent | 1980-06-24 |
| 4185337 | Portable toilet with improved flush apparatus | Frank T. Sargent, Arthur W. Henke, James T. Embach, Frederick A. Butler, Erin J. Lindsay | 1980-01-29 |
| 4185340 | Toilet apparatus | Frank T. Sargent, Arthur W. Henke, John T. Cameron | 1980-01-29 |
| 4180876 | Portable toilets | Frank T. Sargent, Arthur W. Henke, John A. Hoffman, Erin J. Lindsay | 1980-01-01 |