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

Patent Owner(s)

Patent Owner	Address
THE JAPAN STEEL WORKS LTD	TOKYO 141-0032

International Classification(s)

• B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
• B29B:PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE ....
• F04C:ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DIS....
• F03C:POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
• F01C:ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR EN....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hamada, Takuya	Hiroshima, JP	39	35
# of filed Patents : 39 Total Citations : 35
Watada, Satoru	Hiroshima, JP	2	10
# of filed Patents : 2 Total Citations : 10

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Patent Citation Ranking

• 0 Citation Count
• B29C Class

• 0 % this patent is cited more than
• 10 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date
11.5 Year Payment	$7400.00	$3700.00	$1850.00	Dec 16, 2026

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge - 11.5 year - Late payment within 6 months	$160.00	$80.00	$40.00
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

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
June 16, 2015	US,9057264,B2   US9057264B2	GRANTED PATENT AS SECOND PUBLICATION
September 26, 2013	US,20130251582,A1   US20130251582A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 9057264

Screw shaft structure for double-shaft extruder

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Abstract

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A screw shaft structure for a twin screw extruder includes a tapered section (20) provided between a ground section (6) and a screw piece inserting section (8), and a tapered ring (21) fitted onto the tapered section (20). The tapered ring (21) serves as a flange section. An object is to reduce the weight of raw material to be used for manufacturing a screw shaft by combining a tapered section and a tapered ring as a structure of a flange section.

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Description

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Claims

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Claims data not available

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Legal Events

 

• MAFP2022
• MAFP2018
• I2015
• STCF2015
• P2013
• AS2012
• F2012
• PD2011

Date	Code	Event	Description
Nov 30, 2022	MAFP	MAINTENANCE FEE PAYMENT	free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY year of fee payment: 8
Nov 09, 2018	MAFP	MAINTENANCE FEE PAYMENT	free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY year of fee payment: 4
Jun 16, 2015	I	Issuance
May 27, 2015	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Sep 26, 2013	P	Published
Dec 20, 2012	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAMADA, TAKUYA;WATADA, SATORU;REEL/FRAME:030533/0739 Owner name: THE JAPAN STEEL WORKS, LTD., JAPAN Effective Date: Dec 20, 2012
Mar 30, 2012	F	Filing
Mar 31, 2011	PD	Priority Date