Inventor

Chandra P. Khattak

Inventor

Danvers, MA, US

Overview

1980–2017

Patent span

Chemistry

Primary field (CPC C)

Patents· 18 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

Y10Tprimary

Y10TTechnical subjects covered by former us classification23%

C30BSingle-crystal growth21%

B23DPlaning12%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests12%

C01BNon-metallic elements9%

B28DWorking stone or stone-like materials7%

B24DTools for grinding, buffing or sharpening5%

C23CCoating metallic material5%

B22DCasting of metals2%

C04BLime, magnesia2%

PatentTitleYear

9,683,286'Increased polysilicon deposition in a CVD reactor'2017 9,611,565'Crystal growth apparatus with ceramic coating and methods for preventing molten material breach in a crystal growth apparatus'2017 8,647,432'Method of making large surface area filaments for the production of polysilicon in a CVD reactor'2014 8,177,910'System and method for crystal growing'2012 7,927,385'Processing of fine silicon powder to produce bulk silicon'2011 7,918,936'System and method for crystal growing'2011 7,344,596'System and method for crystal growing'2008 6,418,921'Method and apparatus for cutting workpieces'2002 6,368,403'Method and apparatus for purifying silicon'2002 5,972,107'Method for purifying silicon'1999 5,438,973'Shaped blades'1995 5,394,825'Method and apparatus for growing shaped crystals'1995 4,840,699'Gallium arsenide crystal growth'1989 4,727,852'Multi-wafer slicing with a fixed abrasive'1988 4,646,710'Multi-wafer slicing with a fixed abrasive'1987 4,384,564'Process of forming a plated wirepack with abrasive particles only in the cutting surface with a controlled kerf'1983 4,256,530'Crystal growing'1981 4,218,418'Processes of casting an ingot and making a silica container'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–2008Patents assigned to CRYSTAL SYST (11)· patent assignee history

1980Based in Peabody, MA, US· patent location history

1981–2017Based in Danvers, MA, US· patent location history

2011–2012Patents assigned to GT CRYSTAL SYSTEMS LLC (2)· patent assignee history

2011–2017Based in Nashua, NH, US· patent location history

2012–2017Patents assigned to KHATTAK CHANDRA P (4)· patent assignee history

2014–2017Patents assigned to CHARTIER CARL (3)· patent assignee history

2014–2017Patents assigned to GTAT CORP (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CRYSTAL SYST	11	1980–2008
KHATTAK CHANDRA Pself	4	2012–2017
CHARTIER CARL	3	2014–2017
GTAT CORP	3	2014–2017
GT CRYSTAL SYSTEMS LLC	2	2011–2012

Locations

Location	Patents	Span
Danvers, Massachusetts, US	14	1981–2017
Nashua, NH, US	3	2011–2017
Peabody, Massachusetts, US	1	1980