Patent US3157481A successfully refreshed from Google Patents.
Patent US5685673A successfully refreshed from Google Patents.
US5685673A
Expired / Lapsed
US
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Twist drill with reverse flutes
Assignee: Individual
•
Filing: 1996-04-02
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Granted: 1997-11-11
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Expires: 2016-04-02
Abstract
Abstract A twist drill comprising a shank section at a top of the drill and a body section at a bottom of the drill, the body section having two or more flutes which spiral downwardly in a first direction and terminate proximate a point, the drill having cutting lips formed by the flutes and operatively arranged to cut material when the drill is rotated in a second direction opposite that of the orientation of the spiral flutes.
Inventors
- 👤 Wayne C. Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:02
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/02; B23Q; B23Q11/00; B23Q11/10; B23B2250/00; B23B2250/12; B23B2250/124; B23B2251/00; B23B2251/04; B23B2251/043; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/909; Y10T408/9095; Y10T408/9097
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A twist drill comprising a shank section at a top of the drill and a body section at a bottom of the drill, said body section having two or more flutes which spiral downwardly in a first direction and terminate proximate a point, said drill having cutting lips formed by said flutes and operatively arranged to cut material when said drill is rotated in a second direction opposite that of the orientation of said flutes.
Claim 2
Dependent Claim
75 words
A twist drill comprising a shank section at a top of the drill and a body section at a bottom of the drill, said body section having two or more flutes which spiral downwardly in a first direction and terminate proximate a point, said drill having cutting lips formed by said flutes and operatively arranged to cut material when said drill is rotated in a second direction opposite that of the orientation of said flutes.
Claim 3
Dependent Claim
36 words
A twist drill as recited in claim 1 wherein said first direction is clockwise as viewed from the point of the drill, and said second direction is counterclockwise as viewed from the point of the drill.
Claim 4
Dependent Claim
36 words
A twist drill as recited in claim 1 wherein said first direction is counterclockwise as viewed from the point of the drill, and said second direction is clockwise as viewed from the point of the drill.
Claim 5
Dependent Claim
39 words
A twist drill as recited in claim 1 and further comprising means for providing cooling or lubricating fluid to an exterior surface of said drill during drilling, wherein said fluid flows downwardly through said flutes to the cutting lips.
Claim 6
Dependent Claim
14 words
A twist drill as recited in claim 1 wherein said cutting lips are arcuate.
References Cited (Backward Citations)
US3049018A
Cited
US3577808A
Cited
US4111208A
Cited
US4436091A
Cited
US4597697A
Cited
US4655650A
Cited
US5078554A
Cited
US5065647A
Cited
US5273380A
Cited
US5405155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-10 | 2001-05-12 | 2001-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-10 | 2005-05-12 | 2005-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-10 | 2009-05-12 | 2009-11-11 | $7700.00 | Window Closed / Lapsed |