Robertson; David E.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Robertson; David E..The latest application filed is for "pop-up irrigation sprinklers".
- Robertson; David E. - Glendora CA
- Robertson; David E. - Belair AU
- Robertson; David E. - Covina CA
| Patent | Date |
|---|---|
| Pop-up irrigation sprinklers Grant 6,997,393 - Angold , et al. February 14, 2 | 2006-02-14 |
| Combined sprinkler nozzle carrier and display unit Grant D415,415 - Robertson October 19, 1 | 1999-10-19 |
| Folding display frame for forming column-like structures Grant 5,351,843 - Wichman , et al. October 4, 1 | 1994-10-04 |
| Electronic acupuncture unit Grant D299,748 - Robertson February 7, 1 | 1989-02-07 |
| Rotary drive sprinkler Grant 4,787,558 - Sexton , et al. November 29, 1 | 1988-11-29 |
| Rotating stream nozzle Grant 4,781,328 - Robertson November 1, 1 | 1988-11-01 |
| Rotary drive sprinkler Grant 4,625,914 - Sexton , et al. December 2, 1 | 1986-12-02 |
| SEC | 0001395300 | Robertson David E |
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