US4197066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making diamonds
Assignee: HIGH PRESSURE Tech Inc
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Filing: 1979-02-02
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Granted: 1980-04-08
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Expires: 1999-02-02
Abstract
Abstract A piston type system for forming industrial diamonds is provided with a pressure vessel which includes a tungsten carbide member having a central opening which has a tapered mouth at one end, and which is lined with a salt bushing. A charge including invar and graphite to be converted to diamond is inserted within the pressure chamber inside the salt bushing. An end load plate has a central opening of substantially the same diameter as the opening in the salt bushing and has a tapered flange which fits into the tapered mouth in the tungsten carbide pressure vessel. A tungsten carbide piston which has a diameter about 0.003 inch less than the diameter of the opening in the end plate, and which has a lead gasket between its surface and that of the opening in the end plate, is forced through the end plate and applies high pressure at high temperatures to the charge, thereby converting the graphite to diamond after the passage of a suitable period of time. The tungsten carbide piston need only have the diameter of the inner diameter of the salt bushing, instead of a diameter equal to the full I.D. of the tungsten carbide pressure vessel.
Inventors
- 👤 George C. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:25
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/065; B30; B30B; B30B11/00; B30B11/004
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
An improved apparatus for making diamonds comprising: a tungsten carbide pressure vessel having a central cylindrical opening, and having a tapered mouth at one end thereof; an insulating hollow cylindrical salt bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy steel end plate in engagement with said pressure vessel, said end plate having an external taper matching the taper at the mouth of said cylindrical opening, and a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said salt bushing; a tungsten carbide piston having an outer diameter a few thousandths of an inch less than said predetermined diameter of said end plate opening; and means for mounting said piston in said end plate opening to apply pressure to a charge within said salt bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite form included in said charge is converted to diamond while said pressure is maintained.
Claim 2
Dependent Claim
180 words
An improved apparatus for making diamonds comprising: a tungsten carbide pressure vessel having a central cylindrical opening, and having a tapered mouth at one end thereof; an insulating hollow cylindrical salt bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy steel end plate in engagement with said pressure vessel, said end plate having an external taper matching the taper at the mouth of said cylindrical opening, and a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said salt bushing; a tungsten carbide piston having an outer diameter a few thousandths of an inch less than said predetermined diameter of said end plate opening; and means for mounting said piston in said end plate opening to apply pressure to a charge within said salt bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite form included in said charge is converted to diamond while said pressure is maintained.
Claim 3
Dependent Claim
29 words
An apparatus as defined in claim 1 further comprising soft metal bushing means for supporting said piston in said end plate as it is advanced into said pressure vessel.
Claim 4
Dependent Claim
36 words
An apparatus as defined in claim 1 further comprising an additional pressure member in engagement with said end plate and means for accurately locating and aligning said additional pressure member with respect to said end plate.
Claim 5
Dependent Claim
184 words
An improved very high pressure apparatus comprising: a pressure vessel having a cylindrical opening; an insulating hollow cylindrical bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy metal end plate in engagement with said pressure vessel, said end plate having a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said bushing; a piston having an outer diameter slightly less than said predetermined diameter of said end plate opening; means for mounting said piston in said end plate opening to apply pressure to a charge within said bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite form included in said charge is converted to diamond while said pressure is maintained; and means for accurately aligning said end plate with said pressure vessel, said means for aligning including an annular enlargement around the mouth of the opening in said vessel, and a matching annular ridge around the opening in said end plate.
Claim 6
Dependent Claim
184 words
An improved very high pressure apparatus comprising: a pressure vessel having a cylindrical opening; an insulating hollow cylindrical bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy metal end plate in engagement with said pressure vessel, said end plate having a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said bushing; a piston having an outer diameter slightly less than said predetermined diameter of said end plate opening; means for mounting said piston in said end plate opening to apply pressure to a charge within said bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite form included in said charge is converted to diamond while said pressure is maintained; and means for accurately aligning said end plate with said pressure vessel, said means for aligning including an annular enlargement around the mouth of the opening in said vessel, and a matching annular ridge around the opening in said end plate.
Claim 7
Dependent Claim
29 words
An apparatus as defined in claim 4 further comprising soft metal bushing means for supporting said piston in said end plate as it is advanced into said pressure vessel.
Claim 8
Dependent Claim
36 words
An apparatus as defined in claim 4 further comprising: an additional pressure member in engagement with said end plate; and means for accurately locating and aligning said additional pressure member with respect to said end plate.
Claim 9
Dependent Claim
16 words
An apparatus as defined in claim 4 wherein said annular recess and matching ridge are tapered.
Claim 10
Dependent Claim
30 words
An apparatus as defined in claim 4 further comprising means for uniformly heating a charge mounted in said cylindrical opening in said pressure vessel to a temperature above 1,000° centigrade.
Claim 11
Dependent Claim
174 words
An improved very high pressure apparatus comprising: a pressure vessel having a cylindrical opening; an insulating hollow cylindrical bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy metal end plate in engagement with said pressure vessel, said end plate having a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said bushing; a piston having an outer diameter slightly less than said predetermined diameter of said end plate opening; means for mounting said piston in said end plate opening to apply pressure to a charge within said bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite from included in said charge is converted to diamond while said pressure is maintained; and means are provided for heating a charge including graphite uniformly throughout the length of said cylindrical opening is said pressure vessel to a temperature above the diamond formation temperature range.
Claim 12
Dependent Claim
174 words
An improved very high pressure apparatus comprising: a pressure vessel having a cylindrical opening; an insulating hollow cylindrical bushing lining said cylindrical opening, said bushing having a predetermined inner diameter; a high strength heavy metal end plate in engagement with said pressure vessel, said end plate having a central opening aligned with and substantially of equal inner diameter to said predetermined inner diameter of said bushing; a piston having an outer diameter slightly less than said predetermined diameter of said end plate opening; means for mounting said piston in said end plate opening to apply pressure to a charge within said bushing, and for applying sufficient force to said piston to raise the pressure within said charge above the stable diamond state for carbon, whereby carbon in the graphite from included in said charge is converted to diamond while said pressure is maintained; and means are provided for heating a charge including graphite uniformly throughout the length of said cylindrical opening is said pressure vessel to a temperature above the diamond formation temperature range.
References Cited (Backward Citations)
US3548190A
Cited
US3635616A
Cited
US3642412A
Cited
US3704969A
Cited
US4118161A
Cited
US4119708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |