Durfee; LaVerne R.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Durfee; LaVerne R..The latest application filed is for "step drill".
- Durfee; LaVerne R. - Harmony NC
| Patent | Date |
|---|---|
| Step drill Grant 10,328,499 - Durfee | 2019-06-25 |
| Step drill bit with variable helical flute Grant 10,058,929 - Durfee August 28, 2 | 2018-08-28 |
| Step Drill App 20170259350 - Durfee; LaVerne R. | 2017-09-14 |
| Step drill Grant 9,687,915 - Durfee June 27, 2 | 2017-06-27 |
| Step Drill Bit With Variable Helical Flute App 20170129022 - Durfee; LaVerne R. | 2017-05-11 |
| Step drill for wood Grant 9,156,094 - Durfee , et al. October 13, 2 | 2015-10-13 |
| Fastener attracting device for a driver tool Grant D723,896 - Durfee March 10, 2 | 2015-03-10 |
| Step Drill App 20140369776 - Durfee; LaVerne R. | 2014-12-18 |
| Step drill bit Grant 8,764,355 - Durfee July 1, 2 | 2014-07-01 |
| Step Drill For Wood App 20130189044 - Durfee; LaVerne R. ; et al. | 2013-07-25 |
| Step Drill Bit App 20120207557 - Durfee; Laverne R. | 2012-08-16 |
| Spade bit Grant 8,147,174 - Durfee April 3, 2 | 2012-04-03 |
| Multi-blade self feed bit Grant 8,070,398 - Durfee December 6, 2 | 2011-12-06 |
| Self feed bit Grant 8,070,397 - Durfee December 6, 2 | 2011-12-06 |
| Spade Bit App 20110150588 - Durfee; Laverne R. | 2011-06-23 |
| Spade bit Grant 7,922,429 - Durfee April 12, 2 | 2011-04-12 |
| Spade bit Grant 7,905,690 - Durfee March 15, 2 | 2011-03-15 |
| Spade Bit App 20100104387 - Durfee; Laverne R. | 2010-04-29 |
| Drill Bit App 20100003094 - Durfee; LaVerne R. | 2010-01-07 |
| Self Feed Bit App 20090208300 - Durfee; LaVerne R. | 2009-08-20 |
| Multi-blade Self Feed Bit App 20090208302 - Durfee; LaVerne R. | 2009-08-20 |
| Drill bit screw tip Grant 7,544,026 - Durfee June 9, 2 | 2009-06-09 |
| Spade Bit App 20080279647 - Durfee; Laverne R. | 2008-11-13 |
| Drill Bit Screw Tip App 20080193236 - Durfee; Laverne R. | 2008-08-14 |
| Drill Bit App 20080166194 - Durfee; Laverne R. | 2008-07-10 |
| Spade-type Bit App 20080101879 - Durfee; LaVerne R. | 2008-05-01 |
| Lockset drilling guide Grant 7,316,527 - Trettin , et al. January 8, 2 | 2008-01-08 |
| Spade Bit App 20070092348 - Durfee; Laverne R. | 2007-04-26 |
| Lockset drilling guide App 20040240950 - Trettin, David J. ; et al. | 2004-12-02 |
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