Ruohonen; Dorothy
Patent Applications and Registrations
Patent applications and USPTO patent grants for Ruohonen; Dorothy.The latest application filed is for "fire suppression system and emergency annunciation system".
- Ruohonen; Dorothy - Atlantic Mine MI
| Patent | Date |
|---|---|
| Fire suppression system and emergency annunciation system Grant 10,398,916 - Erva , et al. Sep | 2019-09-03 |
| Fire Suppression System and Emergency Annunciation System App 20160263412 - Erva; Michael Walter ; et al. | 2016-09-15 |
| Fire suppression system and emergency annunciation system Grant 9,352,176 - Erva , et al. May 31, 2 | 2016-05-31 |
| Fire Suppression System and Emergency Annunciation System App 20080210443 - Erva; Michael Walter ; et al. | 2008-09-04 |
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