Patents

List of patents obtained from 2009 to 2011

S/N

Invention

Category

Patent No.

1

Location and guiding assembly of vertical hole

Utility

201020212162.9

2

A urea synthesizer

Utility

200920082934.9

3

Alloy steel frog center

Utility

200920314173.5

4

Railway frog

Utility

200920314174.x

5

Alloy steel frog wing rail

Utility

200920314213.6

6

 Ammonia cool combined type

Utility

200920304391.0

7

Railway frog wing rail (1)

Outlook

200930327767.5

8

Railway frog wing rail (2)

Outlook

200930327735.5

9

Railway frog wing rail (3)

Outlook

200930327768.x

10

Hole between heat exchange tube and tube sheet welding method

Invention

200910305748.1

11

Guide to threading heat exchanger tube

Utility

201020511518.9

12

Adjustable tension ring

Utility

201020511519.3

13

Water temperature automatic digital control device  display used for

Utility

201020670144.5

14

Fast opening vessel

Utility

201120126005.0

15

Heat exchanger and tube sheet connecting device

Utility

201120155330.X

16

Leaching ball

Utility

201120126037.0

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