Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12259151 | HVAC motor automation control unit and adjustment methods and apparatus for same | David Lee Haessig, Ronald Sai Kit Yip | 2025-03-25 |
| 12181166 | Methods to monitor air filter life in fan motor controller and apparatus for same | David Lee Haessig, Ronald Sai Kit Yip | 2024-12-31 |
| 12025329 | HVAC motor control local display and adjustment methods and apparatus for same | David Lee Haessig, Ronald Sai Kit Yip, Joshua Lee Welton | 2024-07-02 |
| 4942921 | Forced air ventilation system | David Lee Haessig, Jamshid Jay Hamidi | 1990-07-24 |