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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
VERMONT CASTINGS INC	PRINCE STREET A VERMONT CORP RANDOLPH VT 05060

International Classification(s)

• Non-US Classification not provided for expired patents

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Smith, Vance R	Brookfield, VT	17	285
# of filed Patents : 17 Total Citations : 285
Syme, Duncan C	Norwich, VT	25	195
# of filed Patents : 25 Total Citations : 195

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 5863389

Pulp bleaching reactor for dispersing high consistency pulp into a gaseous bleaching agent containing ozone

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Abstract

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An apparatus for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine. The bleaching reactor is a horizontal vessel having a central rotatable shaft which preferably contains paddles, cut and folded screw flights or a ribbon flight, to disperse and advance the pulp particles in a plug flow manner while contacting and mixing the pulp particles with a gaseous bleaching agent such as ozone for substantially uniform bleaching thereof.

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Description

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Legal Events

 

• FPAY2010
• FPAY2006
• FPAY2002
• FEPP2001
• I1999
• STCF1999
• F1994
• PD1990

Date	Code	Event	Description
Jun 23, 2010	FPAY	FEE PAYMENT	year of fee payment: 12
Jun 23, 2006	FPAY	FEE PAYMENT	year of fee payment: 8
May 22, 2002	FPAY	FEE PAYMENT	year of fee payment: 4
Oct 31, 2001	FEPP	FEE PAYMENT PROCEDURE	free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY
Jan 26, 1999	I	Issuance
Jan 26, 1999	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Mar 08, 1994	F	Filing
Oct 26, 1990	PD	Priority Date