US Patent No: 7,297,908

Number of patents in Portfolio can not be more than 2000

Removing method of tube

ALSO PUBLISHED AS: 20050235473

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

The present invention provides a removing method of a tube. Upon removing a tube 3 increased in diameter and fixed to a tube-sheet 1, an inserted portion 3a which is fixed to a tube-hole 2 of the tube-sheet 1 is heated and then cooled, thereby reducing its diameter. The inserted portion 3a is loosened from the tube-hole 2. Then, a region 3h opposed to a groove 4 formed in an inner circumference of the tube-hole is heated to a red-hot state, and the tube 3 is stretched in its axial direction, the red-heated region 3h is stretched to reduce its diameter and cut the region 3h, thereby pulling out the tube 3 from the tube-sheet 1.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
DAI-ICHI HIGH FREQUENCY CO., LTD.TOKYO16

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurokawa, Yuji Kawasaki, JP 17 134
Sato, Michio Tochigi, JP 71 784
Yoshida, Hirotaka Kawasaki, JP 18 34

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Chicago Bridge & Iron Company (1)
4,421,160 Shell and tube heat exchanger with removable tubes and tube sheets 12 1980

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
BABCOCK & WILCOX CANADA LTD. (2)
7,322,090 Explosive tube removal device 0 2005
7,565,727 Method of tube stub removal 1 2007
 
GE-HITACHI NUCLEAR ENERGY AMERICAS LLC (1)
8,631,563 Apparatus and method for removing a dry tube assembly from a nuclear reactor pressure vessel 0 2009
 
THE BABCOCK & WILCOX POWER GENERATION GROUP, INC. (1)
8,240,049 Tube stub removal apparatus 0 2009

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 May 20, 2015
11.5 Year Payment $7400.00 $3700.00 $1850.00 May 20, 2019
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
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

Full Text

 
loading....