Hartwell; Douglas A
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hartwell; Douglas A.The latest application filed is for "convertible child carrier".
- Hartwell; Douglas A - Vergennes VT
- Hartwell; Douglas A. - S. Burlington VT
| Patent | Date |
|---|---|
| Convertible child carrier Grant 9,314,111 - Hartwell , et al. April 19, 2 | 2016-04-19 |
| Convertible Child Carrier App 20140084037 - Hartwell; Douglas A ; et al. | 2014-03-27 |
| Viscous liquid applicator Grant 5,964,380 - Hazzard , et al. October 12, 1 | 1999-10-12 |
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