| |
 |
|
Class Information
Number: 175/415
Name: Boring or penetrating the earth > Bit or bit element > Impact or percussion type > Combined with rotary
Description: Apparatus in which the cutting edge is formed to disintegrate the formation as a result of simultaneous rotary and a forceful contact or a repetitive striking action.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5033560 |
Drill bit with decreasing diameter cutters |
Jul. 23, 1991 |
| 5029657 |
Rock drill bit |
Jul. 9, 1991 |
| 5004056 |
Percussion-rotary drilling tool |
Apr. 2, 1991 |
| 5004057 |
Drill bit with improved steerability |
Apr. 2, 1991 |
| 5002139 |
Drilling tool |
Mar. 26, 1991 |
| 4962822 |
Downhole drill bit and bit coupling |
Oct. 16, 1990 |
| 4951761 |
Rock drill |
Aug. 28, 1990 |
| 4940097 |
Fluid powered rotary percussion drill with formation disintegration inserts |
Jul. 10, 1990 |
| 4919221 |
Impact drill bit assembly and replaceable parts thereof |
Apr. 24, 1990 |
| 4911729 |
Overburden eliminator rock drill bit |
Mar. 27, 1990 |
| 4903787 |
Rock drill |
Feb. 27, 1990 |
| 4867255 |
Technique for steering a downhole hammer |
Sep. 19, 1989 |
| 4862976 |
Spline drive for percussion drilling tool |
Sep. 5, 1989 |
| 4852672 |
Drill apparatus having a primary drill and a pilot drill |
Aug. 1, 1989 |
| 4836306 |
Down hole drill chuck lock |
Jun. 6, 1989 |
| 4817741 |
Rotary drill |
Apr. 4, 1989 |
| 4771834 |
Percussion drill bit for rock perforators |
Sep. 20, 1988 |
| 4765419 |
Rock drill with cutting inserts |
Aug. 23, 1988 |
| 4716976 |
Rotary percussion drill bit |
Jan. 5, 1988 |
| 4706764 |
Two piece down hole drill chuck |
Nov. 17, 1987 |
| 4702326 |
Coupling arrangement for a drill shank of a percussion drilling machine |
Oct. 27, 1987 |
| 4598779 |
Rock drill bit |
Jul. 8, 1986 |
| 4595322 |
Spade drill bit |
Jun. 17, 1986 |
| 4570725 |
Drill bit cutter |
Feb. 18, 1986 |
| 4503920 |
Masonry bit |
Mar. 12, 1985 |
| 4494613 |
Method and apparatus for driving hollow piles into the ground |
Jan. 22, 1985 |
| 4487275 |
Drilling device for undercut boreholes |
Dec. 11, 1984 |
| 4478296 |
Drill bit having multiple drill rod impact members |
Oct. 23, 1984 |
| 4456083 |
Blast furnace taphole drill |
Jun. 26, 1984 |
| 4440244 |
Drill tool |
Apr. 3, 1984 |
| 4368789 |
Drilling apparatus |
Jan. 18, 1983 |
| 4342368 |
Rotary drills and drill bits |
Aug. 3, 1982 |
| RE30952 |
Percussion drill bit |
Jun. 1, 1982 |
| 4299297 |
Rotary percussion bit |
Nov. 10, 1981 |
| 4294319 |
Cutter head for rotary percussion drills |
Oct. 13, 1981 |
| 4273202 |
Drilling bit for blast furnace tap holes |
Jun. 16, 1981 |
| 4223587 |
Self-drilling dowel assembly with an annular drill bit |
Sep. 23, 1980 |
| 4202421 |
Impact bit having circumferential inserts of differing combination |
May. 13, 1980 |
| 4190128 |
Roof drill bit with hexagonal body portion |
Feb. 26, 1980 |
| 4083415 |
Mining bit with replaceable work engaging member |
Apr. 11, 1978 |
| 4071100 |
Method of making holes of selected external configuration in preferably rock or ground formation, and a drilling machine for carrying out the method |
Jan. 31, 1978 |
| 4051912 |
Percussion drill bit |
Oct. 4, 1977 |
| 3960223 |
Drill for rock |
Jun. 1, 1976 |
|
|
|
