Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8430720 | Apparatus for precision steeling/conditioning of knife edges | Daniel D. Friel, Sr., Daniel D. Friel, Jr., Abraham Leibson | 2013-04-30 |
| RE43884 | Apparatus for precision steeling/conditioning of knife edges | Daniel D. Friel, Sr., Daniel D. Friel, Jr., Abraham Leibson | 2013-01-01 |
| 8267750 | Apparatus for precision steeling/conditioning of knife edges | Daniel D. Friel, Sr., Samuel Weiner | 2012-09-18 |
| 7517275 | Apparatus for precision steeling/conditioning of knife edges | Daniel D. Friel, Sr. | 2009-04-14 |
| 7287445 | Apparatus for precision steeling/conditioning of knife edges | Daniel D. Friel, Sr., Daniel D. Friel, Jr., Abraham Leibson | 2007-10-30 |
| 7235004 | Precision means for sharpening and creation of microblades along cutting edges | Daniel D. Friel, Sr. | 2007-06-26 |
| D542616 | Electric knife sharpener | Bela Elek, Daniel D. Friel, Sr. | 2007-05-15 |
| 6267652 | Versatile ultrahone sharpener | Daniel D. Friel, Sr., Daniel D. Friel, Jr. | 2001-07-31 |
| 6113476 | Versatile ultrahone sharpener | Daniel D. Friel, Sr., Daniel D. Friel, Jr. | 2000-09-05 |
| 6012971 | Sharpening apparatus | Daniel D. Friel, Sr., Daniel D. Friel, Jr. | 2000-01-11 |
| 5611726 | High speed precision sharpening apparatus | Daniel D. Friel, Sr. | 1997-03-18 |
| 5245791 | Scissor sharpening apparatus | Daniel D. Friel, Jr., Steven J. Gluck | 1993-09-21 |
| 5148634 | Scissor sharpening apparatus with magnetic guide | Daniel D. Friel, Sr. | 1992-09-22 |