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Patent applications and USPTO patent grants for Helzer; Bradley D..The latest application filed is for "internal particulate protective obstruction for sprinklers".
Patent | Date |
---|---|
Self-flushing sprinkler mechanism Grant 7,644,870 - Alexander , et al. January 12, 2 | 2010-01-12 |
Internal Particulate Protective Obstruction For Sprinklers App 20090026287 - Helzer; Bradley D. ;   et al. | 2009-01-29 |
Internal particulate protective obstruction for sprinklers Grant 7,434,747 - Helzer , et al. October 14, 2 | 2008-10-14 |
Self-flushing sprinkler mechanism App 20080054092 - Alexander; Mona-Lisa ;   et al. | 2008-03-06 |
Slip gear for geared sprinkler motor Grant 7,261,247 - Yeh , et al. August 28, 2 | 2007-08-28 |
Slip gear for geared sprinkler motor App 20060108446 - Yeh; Jonathan ;   et al. | 2006-05-25 |
Internal particulate protective obstruction for sprinklers App 20060091236 - Helzer; Bradley D. ;   et al. | 2006-05-04 |
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