Koehn; Richard R.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Koehn; Richard R..The latest application filed is for "strand chair for supporting prestressing cable and cross-mesh in elongated precast concrete plank".
- Koehn; Richard R. - Prior Lake MN
- Koehn; Richard R. - St. Louis Park MN
| Patent | Date |
|---|---|
| Strand chair for supporting prestressing cable and cross-mesh in elongated precast concrete plank Grant 4,644,727 - Hanson , et al. February 24, 1 | 1987-02-24 |
| Combination lift insert and weld plate for use in hollow core concrete planks Grant D272,517 - Koehn February 7, 1 | 1984-02-07 |
| Building Load Structure Grant 3,727,362 - Ellison , et al. April 17, 1 | 1973-04-17 |
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