Patent EP0119699A1 successfully refreshed from Google Patents.
US3757879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bits and methods of producing drill bits
Assignee: Norton Christensen Inc
•
Filing: 1972-08-24
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Granted: 1973-09-11
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Expires: 1992-08-24
Abstract
Abstract A diamond bit comprising a steel shank coated with abrasive particles, with a ring of tungsten-coated iron particles bonded together in a metal matrix and by metal to the end of the shank.
Inventors
- 👤 A Wilder
- 👤 H Bridwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
25 words
The drill bit of claim 1 in which the metal encapsulating said iron particles is tungsten, or tantalum, or columbium (niobium) or molybdenum or titanium.
Claim 2
Dependent Claim
27 words
In the drill bit of claim 2, said abrasive particles in said coating are tungsten carbide, or metal-encapsulated alumina, or metal-encapsulated silicon carbide, or metal-encapsulated boron nitride.
Claim 3
Dependent Claim
18 words
In the drill bit of claim 3 in which the ring is metal-bonded tungsten-coated iron or iron-based alloy.
Claim 4
Dependent Claim
43 words
The drill bit of claim 1 in which said coat extends over the crown end of said shank and in which diamond particles are surface set in said end, in space configuration over the said end surface forming the crown of said bit.
Claim 5
Dependent Claim
26 words
The drill bit of claim 5 in which the metal encapsulating particles in said ring is tungsten, or tantalum, or columbium (noibium) or molybdenum or titanium.
Claim 6
Dependent Claim
16 words
The drill of claim 5 in which the ring contains metal-bonded tungsten-encapsulated iron, or iron-based alloy.
Claim 7
Dependent Claim
45 words
The drill of claim 1 in which the coat extends over the crown end of said shank and at said crown end contains a metal-bonded mixture of diamond particles and particles of tungsten carbide, or metal-encapsulated alumina, or metal-encapsulated silicon carbide, or metal-encapsulated boron nitride.
Claim 8
Dependent Claim
27 words
The drill of claim 8 in which the metal-encapsulating said ring contains iron, or iron-based alloy encapsulated with tungsten, or tantalum, or columbium, or molybdenum, or titanium.
Claim 9
Dependent Claim
19 words
In the drill bit of claim 8 in which the ring contains iron or iron-based alloy encapsulated with tungsten.
Claim 10
Dependent Claim
52 words
The drill of claim 1 in which said coat extends over the crown end and contains a mixture of diamond particles and tungsten carbide particles and said coat above said crown is substantially free of diamond particles and contains tungsten carbide, or metal-encapsulated alumina, or metal-encapsulaTed silicon carbide, or metal-encapsulated boron nitride.
Claim 11
Dependent Claim
29 words
The bit of claim 11 in which said encapsulating metal in the particles of metal in said ring is tungsten, or tantalum, or columbium (niobium), or molybdenum, or titanium.
Claim 12
Dependent Claim
17 words
The drill of claim 11 in which the ring contains iron or iron-based alloy encapsulated with tungsten.
References Cited (Backward Citations)
US2125332A
Cited
US2174980A
Cited
US2511991A
Cited
US2582231A
Cited
US2712988A
Cited
US2833520A
Cited
US3145790A
Cited
US3537538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |