US3559961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for the production of dental mixtures poor in porosity
Assignee: Individual
•
Filing: 1968-08-16
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Granted: 1971-02-02
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Expires: 1988-08-16
Abstract
Abstract Apparatus and method for production of dental mixtures poor in porosity from a pulverous material and a material in a liquid state. The two materials are inserted in a chamber which is evacuated by means of a vacuum pump so that the pulverous material is substantially removed from air. The mixing is then performed under vacuum by shaking the chamber or by inserting a spatula in an airtight manner through the wall of the chamber. The vacuum pump is thereafter disengaged from the chamber and the mixture is ready for use.
Inventors
- 👤 Gunnar Bergendal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:41
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/60; A61C5/68; B; B01; B01F; B01F33/00; B01F33/70; A61C19/00; A61C19/007; Y; Y10; Y10S; Y10S366/00; Y10S366/602
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
The process for the production of dental amalgams from a pulverulent metal alloy and liquid mercury metal comprising positioning said pulverulent metal alloy and said liquid mercury metal out of contact with each other in a vacuum mixing chamber, evacuating the air from said vacuum mixing chamber and then mixing said pulverulent metal alloy and said liquid mercury metal within said evacuated vacuum mixing chamber to form a homogeneous dental amalgam.
Claim 2
Dependent Claim
24 words
The process of claim 2 wherein said pulverulent metal alloy and said liquid mercury metal are mixed by agitating said evacuated vacuum mixing chamber.
Claim 3
Dependent Claim
40 words
The process of claim 2 wherein said pulverulent metal alloy and said liquid mercury metal are mixed by vibrating said pulverulent metal alloy and said liquid mercury metal whereby they are brought into contact with each other and homogeneously admixed.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |