Johnson; Harold R.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Johnson; Harold R..The latest application filed is for "energy saving furnace controller".
- Johnson; Harold R. - Mankato MN
- Johnson; Harold R. - Monroe NC
Trademarks
| Patent | Date |
|---|---|
| Energy saving furnace controller Grant 4,667,874 - Johnson , et al. May 26, 1 | 1987-05-26 |
| Air conditioning apparatus and methods using underground duct Grant 4,367,631 - Johnson , et al. January 11, 1 | 1983-01-11 |
| Vertically Adjustable Platform For Scaffolding Grant 3,610,368 - Johnson October 5, 1 | 1971-10-05 |
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