US5256206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CVD diamond for coating twist drills
Assignee: Diamond Innovations Inc
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Filing: 1992-08-14
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Granted: 1993-10-26
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Expires: 2012-08-14
Abstract
Abstract The present invention enables the diamond coating of stationary elongate objects, such as twist drills, with a continuous uniform film without any motion of the twist drill due to the unexpected superb "throwing power" of a reactor disclosed herein. The CVD diamond reactor includes a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and an outlet, in conventional fashion. The improvement for coating with CVD diamond the entire outer surface of at least a portion of a plurality of stationary elongate objects comprises disposed within said reactor, an elongate metal tube having a plurality of apertures for holding elongate objects disposed radially inwardly and having a cooling pipe in thermal contact with and disposed about the outside of said metal tube; and a filament running within said tube along its lengthwise extent and being in electrical connection with the source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation, the portions of said elongate object within said tube surrounding said filament being heated thereby.
Inventors
- 👤 Thomas R. Anthony
- 👤 William F. Banholzer
- 👤 Robert H. Ettinger
- 👤 James F. Fleischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:33
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/44; C23C16/458; C23C16/22; C23C16/26; C23C16/27; C23C16/271
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
129 words
In a CVD diamond reactor of a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and outlet, the improvement for coating with CVD diamond the entire outer surface of at least a portion of a plurality of stationary elongate objects which comprises disposed within said reactor: (a) an elongate metal tube having a plurality of apertures for holding elongate objects disposed readily inwardly and having a cooling pipe in thermal contact with and disposed about the outside of said metal tube; and (b) a filament running within said tube along its lengthwise extent and being in electrical connection with the source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation, the portions of said elongate objects within said tube surrounding said filament being heated thereby.
Claim 2
Dependent Claim
129 words
In a CVD diamond reactor of a vacuum chamber, inlet for feed hydrogen/hydrocarbon mixtures, and outlet, the improvement for coating with CVD diamond the entire outer surface of at least a portion of a plurality of stationary elongate objects which comprises disposed within said reactor: (a) an elongate metal tube having a plurality of apertures for holding elongate objects disposed readily inwardly and having a cooling pipe in thermal contact with and disposed about the outside of said metal tube; and (b) a filament running within said tube along its lengthwise extent and being in electrical connection with the source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation, the portions of said elongate objects within said tube surrounding said filament being heated thereby.
Claim 3
Dependent Claim
13 words
The reactor of claim 1 wherein said metal tube is formed from copper.
Claim 4
Dependent Claim
11 words
The reactor of claim 1 wherein said filament is electrically heated.
Claim 5
Dependent Claim
15 words
The reactor of claim 3 wherein said metal tube is electrically isolated from said filament.
Claim 6
Dependent Claim
13 words
The reactor of claim 4 wherein a voltage is applied to said tube.
Claim 7
Dependent Claim
17 words
The reactor of claim 1 wherein said filament is formed of tungsten, tantalum, molybdenum, or alloys thereof.
Claim 8
Dependent Claim
17 words
The reactor of claim 1 wherein said filament is constrained from movement only along its lengthwise extent.
Claim 9
Dependent Claim
13 words
The reactor of claim 1 wherein said cooling pipe is formed of copper.
Claim 10
Dependent Claim
115 words
In a CVD diamond reactor comprised of a vacuum chamber, an inlet for feeding hydrogen/hydrocarbon mixtures, and an outlet, the improvement which comprises disposed within said reactor: (a) an elongate metal tube having a plurality of apertures for holding elongate objects disposed radially inwardly in a configuration for coating with CVD diamond, (b) a cooling pipe in thermal contact with and disposed about the outside of said metal tube, and (c) a filament running within said tube along its lengthwise extent and being in electrical connection with a source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation and to heat portions of said elongate objects within said metal tube.
Claim 11
Dependent Claim
115 words
In a CVD diamond reactor comprised of a vacuum chamber, an inlet for feeding hydrogen/hydrocarbon mixtures, and an outlet, the improvement which comprises disposed within said reactor: (a) an elongate metal tube having a plurality of apertures for holding elongate objects disposed radially inwardly in a configuration for coating with CVD diamond, (b) a cooling pipe in thermal contact with and disposed about the outside of said metal tube, and (c) a filament running within said tube along its lengthwise extent and being in electrical connection with a source of voltage for heating said filament to a temperature adequate to initiate hydrocarbon disassociation and to heat portions of said elongate objects within said metal tube.
Claim 12
Dependent Claim
34 words
A CVD diamond reactor as in claim 9, wherein the metal tube apertures are adapted to hold the elongate objects in a configuration for coating the entire surface of a portion thereof without rotation.
Claim 13
Dependent Claim
37 words
A CVD diamond reactor as in claim 9, wherein the metal tube apertures are adapted to hold the elongate objects in a configuration so that the surfaces to be coated are at different distances from the filament.
Claim 14
Dependent Claim
22 words
A CVD diamond reactor as in claim 9, wherein the metal tube apertures are adapted to hold at least seven drill bits.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-25 | 1997-04-26 | 1997-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-25 | 2001-04-26 | 2001-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-25 | 2005-04-26 | 2005-10-26 | $7700.00 | Window Closed / Lapsed |