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Tianjin Hengjiweiye Steel Co., Ltd.
Address: Dongli District,
Tianjin Tanggu Highway 396
Contact: Manager Zhou
Mobile: 13702027288
        13012268537
        13012268561
Tel: 022-26623038
     022-26625738
Fax022-26614692
Website:www.hengjigg.com
   Your location!>Home!>R & D!>Patented

Held by national patent
 No. 

Patents  name

Category 

Patent No. / Application No.

Date of application

1

Sealing ring with a wedge thread connection structure

Utility model

200420028489.5

2004.03.10

2

Partial ladder structure of the special screw connection

Utility model

200420028490.8

2004.03.10

3

Casing gas seal threaded joints

Utility model

02209453.9

2002.04.05

4

Casing gas seal threaded joints sealed cone diameter measuring device

Utility model

02209454.7

2002.04.05

5

Resistance to compressionbending of the hook screw connection structure of teeth

Utility model

200620025942.6

2006.04.29

6

Collapsing oil casingproduction methods

Invention

01118711.5

2001.06.07

7

Threaded coupling variable

Invention

01118710.7

2001.06.07

8

Sealed tube screw connection structure

Utility model

200620026317.3

2006.06.08

9

High buttress thread casing sealing connection structure

Utility model

200620026316.9

2006.06.08

10

Casing centralizer coupling

Utility model

200620026344.0

2006.06.12

11

Top bearing casing side face of the twisted connection structure

Utility model

200520026550.7

2005.07.05

12

Adjustable pitch diameter regulation calibrator

Utility model

200520026552.6

2005.07.05

13

Adjustable inner diameter gauge calibrator

Utility model

200520026553.0

2005.07.05

14

Inverted trapezoidal tooth width varying casing thread connection structure

Utility model

200620026659.5

2006.07.11

15

Taper thread diameter calibration regulations

Utility model

02244148.4

2002.07.29

16

Sawtooth-shaped casing thread connection structure

Utility model

200420029557.X

2004.08.18

17

For oil casing oil field water injectionproduction methods

Invention

03144335.4

2003.09.25

18

High-pressure underground gas well casingproduction methods Casing

Invention

03144475.X

2003.09.28

19

Casing structure of adjustable nipple

Utility model

200520027845.6

2005.10.24

20

Congruent straight casing thread connection with the structure

Utility model

200320112138.8

2003.11.07

21

A seamless steel pipesteel production methods

Invention

200510016387.0

2005.11.25

22

Arc of the double ledge seal pipe thread taper structure

Utility model

200620151412.6

2006.11.20

23

Oilgas in deepultra deep oil casing

Invention

200310107074.7

2003.11.21

24

Super heavy oil thermal recovery wells with high strength casingproduction methods

Invention

00100635.5

2000.01.25