Method for applying hardfacing to a matrix substrate of a drill bit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Nov 1, 2016
Grant Date -
Apr 17, 2014
app pub date -
Dec 16, 2013
filing date -
Feb 15, 2012
priority date (Note) -
In Force
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Abstract
A method for hardfacing a drill bit includes applying a hardfacing material to a matrix metal forming the substrate of the drill bit. The hardfacing material is applied using a plasma arc welding process. A metallurgical bond is formed between the matrix metal and the hardfacing material. The matrix metal may include tungsten carbide and a braze filler metal.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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VAREL INTERNATIONAL IND L P | 1625 WEST CROSBY SUITE 124 CARROLLTON TX 75006 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Amundsen, Marvin Windsor | Houston, US | 8 | 16 |
# of filed Patents : 8 Total Citations : 16 | |||
Johnson, Charles Daniel | Porter, US | 11 | 284 |
# of filed Patents : 11 Total Citations : 284 |
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- 9 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 1, 2028 |
Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
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

Legal Events
Date | Code | Event | Description |
---|---|---|---|
Aug 13, 2018 | LAPS | LAPSE FOR FAILURE TO PAY MAINTENANCE FEES | free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
Aug 13, 2018 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Feb 26, 2018 | FEPP | FEE PAYMENT PROCEDURE | free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.) |
Jul 15, 2014 | I | Issuance | |
Jul 05, 2012 | P | Published | |
Mar 07, 2012 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GIUDICEANDREA, FEDERICO;MATTHEWS, PETER;REEL/FRAME:027838/0155 Owner name: MICROTEC S.R.L., ITALY Effective Date: Mar 07, 2012 |
Jul 15, 2009 | F | Filing | |
Jul 15, 2009 | PD | Priority Date |

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