David B Schumaker

US Patent:

20050278877, Dec 22, 2005

Filed:

Jun 22, 2004

Appl. No.:

10/873584

Inventors:

Robert Akridge - Seattle WA, US
Kenneth Pilcher - Seattle WA, US
David Schumaker - Morristown TN, US

International Classification:

A46B013/02

US Classification:

015028000

Abstract:

The bristle arrangement includes a first brush portion which has a first set of bristles, the first brush portion being arranged in an annular configuration, and remains stationary in operation of the appliance. The bristle arrangement also includes a second brush portion which has a second set of bristles, wherein the second brush portion oscillates at a selected frequency. The second set of bristles has a circular arrangement, fitting within the opening of the annular arrangement of the first set of bristles. The first and second sets of bristles have a diameter within the range of 3 mils to 5 mils, and a length in the range of 0.3 to 0.425 inches. The first bristle set includes 40 to 100 bristle tufts and the second bristle set includes 40 to 120 bristle tufts, which are substantially evenly spread, respectively.

US Patent:

56454260, Jul 8, 1997

Filed:

Sep 27, 1995

Appl. No.:

8/534811

Inventors:

Carlton L. Grim - Red Lion PA
David B. Schumaker - Morristown TN

Assignee:

Dentsply Research & Development Corp. - Milford DE

International Classification:

A61C 306

US Classification:

433125

Abstract:

A prophy angle having a single improved snap-in mounting shaft having an enlarged snap-through outer boss portion that is discontinuous in circumference for retaining the prophy cup rotor in permanent position and isolating the rotor from frictionally engaging other parts other than through the gearing except under stress, a press fit drive shaft retention locking sleeve that frictionally engages the housing when pressed into locking position, a reduction of the surface contact of the drive shaft with the inside of the housing by introducing vanes in contact with the housing wall rather than a continuous cylinder contact, and a closed vent hole with a hub on the drive shaft.

Address:

3723 Lk Pt Dr, Morristown, TN 37814

Phone:

(423)5813572

VIN:

1GKS2KE77CR176701

Make:

GMC

Model:

YUKON XL

Year:

2012