WIEHN; Helmut
Patent Applications and Registrations
Patent applications and USPTO patent grants for WIEHN; Helmut.The latest application filed is for "fire retarding composition for use in wood composite panels".
- WIEHN; Helmut - Heuchelheim-Klingen DE
- Wiehn; Helmut - Oberhausen DE
| Patent | Date |
|---|---|
| Fire Retarding Composition For Use In Wood Composite Panels App 20190330531 - WIEHN; Helmut ; et al. | 2019-10-31 |
| Fire-resistant "oriented strand board" material Grant 8,642,184 - Wiehn , et al. February 4, 2 | 2014-02-04 |
| Fire-resistant "oriented Strand Board" Material App 20120251817 - WIEHN; Helmut ; et al. | 2012-10-04 |
| Method of and burner for burning liquid or gaseous fuels with decreased NO.sub.x formation Grant 4,575,332 - Oppenberg , et al. March 11, 1 | 1986-03-11 |
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