Issued Patents All Time
Showing 1–25 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8215897 | Cylindrical wind turbine | Karl J. Douglass, Robert G. Dickie | 2012-07-10 |
| 7513746 | Windmill blade shaping and mounting to enhance performance | — | 2009-04-07 |
| 7487922 | Windmill damper operator | — | 2009-02-10 |
| 7267530 | Windmill apparatuses and methods of mounting blades to enhance their performance | — | 2007-09-11 |
| 6557583 | Electric power modulated lead screw actuated dampers and methods of modulating their operation | — | 2003-05-06 |
| 6454528 | Intake and exhaust damper with movable motor fan assembly | — | 2002-09-24 |
| 6447393 | Electric power modulated lead screw actuated butterfly blade damper and method of controlling air flow and pressure and pneumatic two position operator | — | 2002-09-10 |
| 6224481 | Power modulating lead screw actuated butterfly blade action damper | — | 2001-05-01 |
| 6190122 | Intake and exhaust air damper with movable motor fan assembly | — | 2001-02-20 |
| 6132181 | Windmill structures and systems | — | 2000-10-17 |
| 6116178 | Sail | — | 2000-09-12 |
| 6039533 | Fan blade, structures and methods | — | 2000-03-21 |
| 6030179 | Airfoil structures and method | — | 2000-02-29 |
| 6010307 | Propeller, structures and methods | — | 2000-01-04 |
| 5937778 | Sail | — | 1999-08-17 |
| 5768839 | Central flange mounted damper | — | 1998-06-23 |
| 5711653 | Air lifted airfoil | — | 1998-01-27 |
| 5623796 | Method and apparatus for mounting a fire damper | — | 1997-04-29 |
| 5599172 | Wind energy conversion system | — | 1997-02-04 |
| 5393263 | Access door eliminator for curtain fire dampers | — | 1995-02-28 |
| 5259397 | Foam counterpressure garment | — | 1993-11-09 |
| 5146932 | Elastic counterpressure garment | — | 1992-09-15 |
| 4919329 | Thermally activated automatic damper and damper operator | — | 1990-04-24 |
| 4905344 | Heat actuated link | — | 1990-03-06 |
| 4817912 | Bi-metal operator for smoke, fire and air control damper | — | 1989-04-04 |