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

Patent Owner(s)

Patent Owner	Address
THE CHARLES MACHINE WORKS INC	1959 WEST FIR AVENUE P O BOX 66 PERRY OK 73077-0066

International Classification(s)

• F16L:PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR ....

• 2014 Application Filing Year
• F16L Class
• 1655 Applications Filed
• 1375 Patents Issued To-Date
• 83.09 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Aus, Kelvin C	Watertown, US	8	25
# of filed Patents : 8 Total Citations : 25

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Patent Citation Ranking

• 0 Citation Count
• F16L Class

• 0 % this patent is cited more than
• 8 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	Aug 21, 2028

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
February 21, 2017	US,9574696,B2   US9574696B2	GRANTED PATENT AS SECOND PUBLICATION
September 18, 2014	US,20140270970,A1   US20140270970A1	FIRST PUBLISHED PATENT APPLICATION

Full Text

US Patent No: 9574696

Stepped load pull back using rams

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Abstract

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A thrust apparatus for a rod string. The apparatus has a stationary frame, a thrust frame with a rod gripper, two hydraulic cylinders and two rams in fluid communication with the hydraulic cylinders. During low-load operations, the hydraulic cylinders act alone, providing the load to the grippers to pull or push the rod string. When higher loads are required, a check valve is activated, allowing fluid from the hydraulic cylinders to activate the rams. The rams provide additional force to the grippers, and may be activated without mechanical or significant hydraulic changes to the apparatus.

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Description

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Claims

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Claims data not available

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Legal Events

 

• MAFP2024
• MAFP2020
• AS2019
• CC2017
• I2017
• STCF2017
• P2014
• AS2014
• F2014

Date	Code	Event	Description
Jul 23, 2024	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
Jul 31, 2020	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
Dec 17, 2019	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EARTH TOOL COMPANY, LLC;REEL/FRAME:051344/0463 Owner name: THE CHARLES MACHINE WORKS, INC., OKLAHOMA Effective Date: Dec 17, 2019
Apr 11, 2017	CC	CERTIFICATE OF CORRECTION
Feb 21, 2017	I	Issuance
Feb 01, 2017	STCF	INFORMATION ON STATUS: PATENT GRANT	free format text: PATENTED CASE
Sep 18, 2014	P	Published
Apr 02, 2014	AS	ASSIGNMENT	free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AUS, KELVIN C;REEL/FRAME:032617/0679 Owner name: EARTH TOOL COMPANY LLC, WISCONSIN Effective Date: Apr 02, 2014
Mar 12, 2014	F	Filing