Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889280 | Temperature and humidity auctioneering control | J. Ward MacArthur | 1989-12-26 |
| 4873649 | Method for operating variable speed heat pumps and air conditioners | J. Ward MacArthur | 1989-10-10 |