Resources
Contact Us
Home
Browse by:
INVENTOR
PATENT HOLDER
PATENT NUMBER
DATE
Browse by Category:
Main
>
Construction
Class Information
Number:
175/299
Name:
Boring or penetrating the earth
>
Below-ground (1) hammer, or (2) impact members
> Resiliently biased
Description:
Apparatus in which an elastic member acts upon the hammer or impact device to urge said hammer or impact device toward or away from a jarring position.
Patents under this class:
1
2
Patent Number
Title Of Patent
Date Issued
4440245
Gravity percussion drill with upper end cocking spring and method of assembly
Apr. 3, 1984
4361195
Double acting hydraulic mechanism
Nov. 30, 1982
4333542
Downhole fishing jar mechanism
Jun. 8, 1982
4207756
Tension shock absorber device
Jun. 17, 1980
4194582
Double acting shock absorbers for drill strings
Mar. 25, 1980
4142597
Mechanical detent jars
Mar. 6, 1979
3980146
Fishing tool energizer and polymer energy storage element embodied therein
Sep. 14, 1976
1
2
Recently Added Patents
Use of amino acids for making medicines for treating to insulin-resistance
Magazine for inventorying reaction cuvettes in an automatic analyzer
Method of manufacturing a memory device having improved erasing characteristics
Precision capacitor array
Cargo bed step
Image forming apparatus
Advertisement information providing system
Randomly Featured Patents
Method for virtual clipping a three-dimensional graphics image
Reconfigurable toy insect
Expansible mandrel
Semiconductor device utilizing annealed semiconductor layer as channel region
Basic aluminum and aluminum/zirconium antiperspirants and method of making the same
Color corrected motor vehicle headlight
Water pump with electronically controlled viscous coupling drive
Gymnastic pole and mount therefor
Plastics which cure in a series of steps having urethane, urea, siloxane and acrylate groups
Remote control system, on-vehicle equipment and remote control method
© 2006-2008 PatentGenius. All Rights Reserved.
