Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002709 | Method of making a foam insulated vessel | John D. Pfeffer, Thomas F. Brownell | 1991-03-26 |
| 4975560 | Apparatus for powering the corrosion protection system in an electric water heater | Daher T. Wardy, Timothy H. Houle, Calvin O. Huber | 1990-12-04 |
| 4957097 | Foam insulated vessel and method of making the same | John D. Pfeffer, Thomas F. Brownell | 1990-09-18 |
| 4945892 | Water heater with outer jacket dam | John D. Pfeffer, Leslie R. Wright | 1990-08-07 |
| 4879801 | Cathodically protected water heater | James S. Stubbe, Edwin C. Pow | 1989-11-14 |
| 4838208 | Cathodically protected water heater | James S. Stubbe, Edwin C. Pow | 1989-06-13 |
| 4790290 | Method and apparatus for foam insulating a vessel | Douglas D. King, John D. Pfeffer | 1988-12-13 |
| 4783896 | Method of making cathodically protected water heater | James S. Stubbe, Edwin C. Pow | 1988-11-15 |
| 4784087 | Clamping apparatus for use in foaming water heaters | Douglas D. King, John D. Pfeffer, Allen L. Johnson | 1988-11-15 |