David A Copeland

US Patent:

45327181, Aug 6, 1985

Filed:

Dec 30, 1983

Appl. No.:

6/567337

Inventors:

David C. Copeland - Medford NJ

International Classification:

G01C 936

US Classification:

33390

Abstract:

A plumbing apparatus including a circular spirit level attached to a straight edge body adapted to carry a reference point vertically wherein the level is large enough to span a hole in the floor with marking guides on the periphery to fix lines that pass through a central axis of the level with a rod attached to the level extending through the hole to align with a reference point with a template spanning a second hole to define the reference point.

US Patent:

20180206956, Jul 26, 2018

Filed:

Jan 25, 2018

Appl. No.:

15/879666

Inventors:

- York PA, US
Naim Karazivan - Repentigny, CA
Christos Angeletakis - Bear DE, US
Thomas Ruth - South Easton MA, US
William Kane - Sutton MA, US
Joseph Gordon - Mansfield MA, US
Luke Hagan - Seattle WA, US
David Copeland - Minnetonka MN, US
Andrew Burke - Saunderstown RI, US
Dustin Gaidos - Milton MA, US
Leonid Silverman - Cranston RI, US
Kenneth Focht - Needham MA, US

Assignee:

DENTSPLY SIRONA Inc. - York PA

International Classification:

A61C 13/15
A61C 9/00

Abstract:

A light curing impression system comprising a light emitting tray that precisely distributes an optimal amount of curing light energy to internal, external and extra oral portions of the dental arch to cure impression material. The light curing impression system generally includes an LED light source, a light emitting impression tray, an activation module and impression material.