Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUSD404044 S
Publication typeGrant
Application numberUS 29/080,107
Publication dateJan 12, 1999
Filing dateDec 1, 1997
Publication number080107, 29080107, US D404044 S, US D404044S, US-S-D404044, USD404044 S, USD404044S
InventorsRobert W. Arfele, George A. Espiritu, Ed R. Martin, Jr.
Original AssigneeDresser Industries, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Six blade drill bit
US D404044 S
Abstract  available in
Previous page
Next page
  1. The ornamental design for a six blade drill bit, as shown and described.

FIG. 1 is a top plan view of a six blade drill bit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, front, left side perspective view thereof.

Non-Patent Citations
1Catalogue/Brochure page: "Diataq DS." Admitted prior art.
2Catalogue/Brochure page: "Hycalog Introduces the Hybrid-Fishtail." Hycalog. Admitted prior art.
3Catalogue/Brochure page: "Longer Bit Life and Superior Downhole Performance." Hycalog. Admitted Prior Art.
4Catalogue/Brochure page: "PD-7 Rotary and Motor Bit; PD-11 Rotary Bit; PD-11X2 Rotary Bit." Admitted prior art.
5Catalogue/Brochure page: "Put the Best on the Bottom." BiTech. Admitted prior art.
6Catalogue/Brochure page: "Smith Diamond's New S-95: The Right Direction in Soft Formations." Smith International. Admitted prior art.
7Catalogue/Brochure page: "Strata-Cut Drilling-Bits." Admitted prior art.
8Catalogue/Brochure page: "The Fast Track to the Bottom Line," p. 8. Strata Bit. Admitted prior art.
9Catalogue/Brochure pages: "A Strong Line of Natural Diamond and PDC Bits." Smith Diamond. Admitted prior art.
10Catalogue/Brochure pages: "Bit Description" Admitted prior art.
11Catalogue/Brochure pages: "Cut Drilling Costs 40 Percent or More with a Strata Bit PDC Bit Tailored to the Formation." Strata Bit. Admitted prior art.
12Catalogue/Brochure pages: "Diamond Compact Bits (R-Series)," pp. 11-12. Eastman Christensen. Admitted prior art.
13Catalogue/Brochure pages: "Diamond Compact Bits (R-Series)." Norton Christensen Drilling Products. Admitted prior art.
14Catalogue/Brochure pages: "Diamond Drill Bits." Cristal Profor. Tarbes, France. Admitted prior art.
15Catalogue/Brochure pages: "Diamond Products." Smith International, pp. 12-13. Admitted prior art.
16Catalogue/Brochure pages: "DP6 PDC Drill Bit." Admitted prior art.
17Catalogue/Brochure pages: "Drilling Bits." Petroleum Diamond Products. Admitted prior art.
18Catalogue/Brochure pages: "Nortrak Navigation Drilling Systems," pp. 4-5. Nortrak. Admitted prior art.
19Catalogue/Brochure pages: "Standard PDC Bits; Standard Ringcutter PDC Bits; Gold Series Bit." Admitted prior art.
20Catalogue/Brochure pages: "TD 2000 Series Drill Bits; TD Drill Bits; PD Steel Body Drill Bits." Diamond Boart Stratabit. Admitted prior art.
21Catalogue/Brochure pages: "Technical Data." Eastman Christensen. Admitted prior art.
22Catalogue/Brochure pages: "VIII. Diamond Drilling & Coring Bits," pp. 47-48. Eastman Christensen. Admitted prior art.
23Catalogue/Brochure pages: 6 3/4 in. DS42H, et al. Hycalog. Admitted prior art.
24Catalogue/Brochure pages: 8 1/2 in Hornet 4, et al. Reed Tool Company. Admitted prior art.
25Catalogue/Brochure pages: IADC S946, et al. Smith Diamond. Admitted prior art.
26Catalogue/Brochure pages: Rock Digger 15, et al. Admitted prior art.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
USD758463 *Nov 19, 2014Jun 7, 2016Mitsubishi Heavy Industries Machine Tool Co., Ltd.Gear cutting tool
USD760826 *Jun 16, 2015Jul 5, 2016Mitsubishi Heavy Industries Machine Tool Co., Ltd.Gear cutting tool
U.S. ClassificationD15/139