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US4577973A
Expired / Lapsed
US
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Method and device for mixing under vacuum mixtures used in dental, goldsmith fields or the like
Assignee: Individual
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Filing: 1984-02-14
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Granted: 1986-03-25
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Expires: 2004-02-14
Abstract
Abstract A mixture of a powder and a liquid is formed and poured, under vacuum into suitable containers for the subsequent production of molds to be employed in dental and goldsmith fields. In order to achieve the best degassing conditions and to avoid the production of foams and bubbles in the course of the vacuum mixing step, separate degassing of the liquid and powder components of the mixture is performed in separate vessels before the mixing step, followed by a combination, for example by pouring, of the components in one of the vessels, while maintaining the vacuum conditions.
Inventors
- 👤 Luciano Occelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:22
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/80; B01F27/88; B01F33/00; B01F33/70; B01F33/80; B01F33/85
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
A method for forming under a vacuum a mixture of a powder and a liquid, intended to be admitted into containers for the subsequent production of molds in the dental or goldsmith fields or the like, said method comprising: individually degassing the liquid and powder components of the mixture in separate respective liquid and powder vessels under vacuum before mixing said liquid and powder components; and then combining said liquid and powder components and subjecting them to a mixing operation, while maintaining vacuum conditions.
Claim 2
Independent Claim
84 words
A method for forming under a vacuum a mixture of a powder and a liquid, intended to be admitted into containers for the subsequent production of molds in the dental or goldsmith fields or the like, said method comprising: individually degassing the liquid and powder components of the mixture in separate respective liquid and powder vessels under vacuum before mixing said liquid and powder components; and then combining said liquid and powder components and subjecting them to a mixing operation, while maintaining vacuum conditions.
Claim 3
Dependent Claim
26 words
A method as claimed in claim 1, comprising producing in said powder degassing vessel a vacuum level different from that produced in said liquid degassing vessel.
Claim 4
Dependent Claim
27 words
A method as claimed in claim 2, wherein said vacuum level produced in said powder degassing vessel is higher than that produced in said liquid degassing vessel.
Claim 5
Dependent Claim
31 words
A method as claimed in claim 1, comprising conducting said individual degassing in two or more subsequent evacuation operations, between which inert gas is admitted into at least one said vessel.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1, comprising transferring said degassed liquid from said liquid vessel to said powder vessel and conducting said mixing in said powder vessel.
Claim 7
Independent Claim
118 words
An apparatus for forming under vacuum a mixture of a powder and a liquid and intended to be used in dental or goldsmith fields or the like, said apparatus comprising: a lower bell housing at least one container into which the mixture is to be poured; an upper bell defining a mixing vessel and controllably operable to be connected to said lower bell; a vacuum source controllably connectable to said lower bell and/or said upper bell; a second vessel for temporarily receiving the liquid or the powder; means for controllably connecting said vacuum source to said second vessel; and means for fluidic connection of said second vessel to said mixing vessel, while substantially maintaining the respective vacuum conditions.
Claim 8
Independent Claim
118 words
An apparatus for forming under vacuum a mixture of a powder and a liquid and intended to be used in dental or goldsmith fields or the like, said apparatus comprising: a lower bell housing at least one container into which the mixture is to be poured; an upper bell defining a mixing vessel and controllably operable to be connected to said lower bell; a vacuum source controllably connectable to said lower bell and/or said upper bell; a second vessel for temporarily receiving the liquid or the powder; means for controllably connecting said vacuum source to said second vessel; and means for fluidic connection of said second vessel to said mixing vessel, while substantially maintaining the respective vacuum conditions.
Claim 9
Dependent Claim
55 words
An apparatus as claimed in claim 6, wherein said upper bell is connected directly or through said lower bell to said vacuum source, while said second vessel is pneumatically connected to said upper bell through a valve element which can be controlled to have different vacuum conditions with respect to those of said upper bell.
Claim 10
Dependent Claim
30 words
An apparatus as claimed in claim 7, further comprising means for controllably connecting an inert gas source to one of said lower and upper bells and/or to said second vessel.
Claim 11
Dependent Claim
43 words
An apparatus as claimed in claim 6, wherein said second vessel is located in an upper opening of said mixing vessel and can be hydraulically connected thereto through at least one opening controlled by a valve which can be operated from the outside.
Claim 12
Dependent Claim
53 words
An apparatus as claimed in claim 9, further comprising a shaft extending in sealed relationship through said second vessel and carrying first mixing blades operating in said second vessel and second mixing blades operating in said mixing vessel, said shaft being connected to an actuating means for rotating said shaft and said blades.
Claim 13
Dependent Claim
37 words
An apparatus as claimed in claim 6, wherein said second vessel is located laterally of said mixing vessel and is hydraulically connected thereto through a conduit, and further comprising a pressure changing means in said second vessel.
Claim 14
Dependent Claim
31 words
An apparatus as claimed in claim 11, wherein said pressure changing means in said second vessel comprises a piston movable in sealed relation within said second vessel upon an exterior control.
Claim 15
Dependent Claim
41 words
An apparatus as claimed in claim 6, wherein said lower bell is provided with a removable cover on which said upper bell is located, said cover and said upper bell being independently supported so as to rotate about a supporting pin.
Claim 16
Dependent Claim
47 words
An apparatus as claimed in claim 13, wherein said removable cover is maintained positioned on said shaft by axial pressure exerted by a cover of said upper bell on a knob mounted on said plate and coaxial to said shaft upon the evacuation of said lower bell.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |