US3704969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing diamonds
Assignee: Teledyne Inc
•
Filing: 1970-08-13
•
Granted: 1972-12-05
•
Expires: 1990-08-13
Abstract
Abstract A machine is disclosed for converting graphite to diamond which includes a cylindrical reaction chamber and a reaction vessel positioned in the reaction chamber for holding the charge of graphite to be converted to diamond. A piston having a fixed length and fixed diameter is positioned in the reaction chamber with its first end contacting the reaction vessel and its second end extending out of the reaction chamber. Means are provided for applying a force to the second end of the piston, thereby generating high pressure within the reaction chamber. Further means are provided for maintaining the ratio of the unsupported length to the diameter of the piston at a value less than the ratio of the fixed length to the fixed diameter of the piston.
Inventors
- 👤 George C Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:21
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/065; C; C01; C01B; C01B32/00; C01B32/25; C01B32/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
234 words
A machine for converting graphite to diamond, comprising in combination: a body formed from high pressure resistant material having a cylindrical cavity therein which forms a cylindrical reaction chamber having a predetermined diameter, a cylindrical reaction vessel positioned in said chamber for holding a charge of graphite to be converted to diamond, said reaction vessel having an outside diameter such that it has a snug sliding fit with said reaction chamber, a piston having a cross-section substantially corresponding to the cross-section of said cylindrical reaction chamber and having a fixed length and fixed constant diameter positioned in said reaction chamber, the fixed diameter of said piston being substantially equal to the outside diameter of said reaction vessel for a distance along said piston sufficient to allow said piston to advance further into said reaction chamber to maintain constant pressure on said reaction vessel during the time that said graphite is being converted to diamond, said piston being positioned so that its first end can exert force against said reaction vessel and its second end extends out of said reaction chamber, means for applying a force to said second end of said piston, thereby generating high pressure within said reaction chamber, and means for maintaining the ratio of the unsupported length to the diameter of said piston at a value less than the ratio of the fixed length to the fixed diameter of said piston.
Claim 2
Dependent Claim
234 words
A machine for converting graphite to diamond, comprising in combination: a body formed from high pressure resistant material having a cylindrical cavity therein which forms a cylindrical reaction chamber having a predetermined diameter, a cylindrical reaction vessel positioned in said chamber for holding a charge of graphite to be converted to diamond, said reaction vessel having an outside diameter such that it has a snug sliding fit with said reaction chamber, a piston having a cross-section substantially corresponding to the cross-section of said cylindrical reaction chamber and having a fixed length and fixed constant diameter positioned in said reaction chamber, the fixed diameter of said piston being substantially equal to the outside diameter of said reaction vessel for a distance along said piston sufficient to allow said piston to advance further into said reaction chamber to maintain constant pressure on said reaction vessel during the time that said graphite is being converted to diamond, said piston being positioned so that its first end can exert force against said reaction vessel and its second end extends out of said reaction chamber, means for applying a force to said second end of said piston, thereby generating high pressure within said reaction chamber, and means for maintaining the ratio of the unsupported length to the diameter of said piston at a value less than the ratio of the fixed length to the fixed diameter of said piston.
Claim 3
Dependent Claim
66 words
The combination of claim 1 in which said means for maintaining the ratio of the unsupported length to the diameter of said piston at a value less than the ratio of the fixed length to the fixed diameter of said piston comprises a first binding ring positioned around said second end of said piston and a second binding ring positioned around the body of said piston.
Claim 4
Dependent Claim
46 words
The combination of claim 2 in which said second binding ring is positioned around the body of said piston with a sliding friction fit so that said second binding ring slides along the body of said piston as said piston traverses further into said reaction chamber.
Claim 5
Dependent Claim
28 words
The combination of claim 1 in which the ratio of the unsupported length to the diameter of said piston is maintained at a value of less than one.
Claim 6
Dependent Claim
69 words
The combination of claim 1 in which said reaction vessel comprises a cylinder having an outer diameter substantiaLly equal to the inner diameter of said reaction chamber and having a length shorter than the length of said reaction chamber, an electrically conductive sleeve positioned concentrically within said cylinder and first and second electrically conductive end caps closing the ends of said cylinder and making electrical contact with said sleeve.
Claim 7
Dependent Claim
22 words
The combination of claim 5 in which said cylinder is formed from an anhydrogenous material and said sleeve is formed from graphite.
Claim 8
Dependent Claim
28 words
The combination of claim 6 which further includes means for heating said reaction vessel, comprising means for applying an electrical potential between said first and second end caps.
Claim 9
Dependent Claim
66 words
The combination of claim 7 in which said means for maintaining the ratio of the unsupported length to the diameter of said piston at a value less than the ratio of the fixed length to the fixed diameter of said piston comprises a first binding ring positioned around said second end of said piston and a second binding ring positioned around the body of said piston.
Claim 10
Dependent Claim
46 words
The combination of claim 8 in which said second binding ring is positioned around the body of said piston with a sliding friction fit so that said second binding ring slides along the body of said piston as said piston traverses further into said reaction chamber.
Claim 11
Dependent Claim
28 words
The combination of claim 9 in which the ratio of the unsupported length to the diameter of said piston is maintained at a value of less than one.
References Cited (Backward Citations)
US2941250A
Cited
US2992900A
Cited
US3084388A
Cited
US3082477A
Cited
US3107395A
Cited
US3067465A
Cited
US3423794A
Cited
US3255490A
Cited
US3313871A
Cited
US3407445A
Cited
US3555597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |