Back to results
US 7,887,628 B2Granted
Thick single crystal diamond layer method for making it and gemstones produced from the layer
AssigneeElement Six Technologies (Pty) Ltd
InventorsGeoffrey Alan Scarsbrook, Philip Maurice Martineau, Barbel Susanne Charlotte Dorn, Michael Andrew Cooper, John Lloyd Collins, Andrew John Whitehead, Daniel James Twitchen, Ricardo Simon Sussman
Life of this patent
Estimating the term…
Abstract
A layer of single crystal CVD diamond of high quality having a thickness greater than 2 mm. Also provided is a method of producing such a CVD diamond layer.
Claims49
A layer of single crystal CVD diamond having a thickness of greater than 2 mm, wherein the layer has one or more of the following characteristics:
- (a) a level of any single impurity of not greater than 1 ppm and a total impurity content of not greater than 5 ppm where impurity excludes hydrogen and its isotopic forms;
- and
- (b) in electron paramagnetic resonance (EPR), a single substitutional nitrogen centre [N—C]0 at a concentration<100 ppb.
Dependencies are inferred from the claim text.