US4199866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental amalgamation apparatus
Assignee: Weatherford Oil Tool Co Ltd
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Filing: 1977-06-20
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Granted: 1980-04-29
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Expires: 1997-06-20
Abstract
Abstract The invention provides a dental amalgamator which prevents mercury vapor, given off during amalgamation, from polluting the air in the neighborhood of the amalgamator. The amalgamator comprises a casing carrying a capsule holder and a drive means for the holder, a lid movable to a closed position in which it cooperates with the casing to form an enclosure for a capsule held by the holder, the enclosure having air inlets allowing air to flow from the atmosphere into the enclosure. A vacuum pump is arranged to communicate with the enclosure via a mercury filter medium, so that during amalgamation air is drawn into the enclosure, over the capsule, and then through the mercury filter where mercury vapors are removed.
Inventors
- 👤 Frederick H. Drury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:46
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/60; A61C5/68; B; B01; B01F; B01F31/00; B01F31/20; Y; Y10; Y10S; Y10S366/00; Y10S366/602
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
A dental amalgamator comprising: a casing, a capsule holder and drive means therefor, said capsule holder being located outside the casing, said drive means being mounted within the casing, an arm connecting the capsule holder to the drive means, a lid movable to a closed position in which the lid forms with a portion of the external surface of the casing an enclosure which surrounds the capsule holder, said enclosure-forming portion of the external surface of the casing including an aperture, said enclosure having air inlet means to allow air to flow thereinto from the atmosphere, said casing being substantially sealed except for an outlet adapted for connection to a vacuum source, whereby during amalgamation air may be drawn by the vacuum source into the enclosure, the air mixing with mercury vapors within the enclosure and then being drawn through said aperture into the casing and thence out of said outlet.
Claim 2
Dependent Claim
151 words
A dental amalgamator comprising: a casing, a capsule holder and drive means therefor, said capsule holder being located outside the casing, said drive means being mounted within the casing, an arm connecting the capsule holder to the drive means, a lid movable to a closed position in which the lid forms with a portion of the external surface of the casing an enclosure which surrounds the capsule holder, said enclosure-forming portion of the external surface of the casing including an aperture, said enclosure having air inlet means to allow air to flow thereinto from the atmosphere, said casing being substantially sealed except for an outlet adapted for connection to a vacuum source, whereby during amalgamation air may be drawn by the vacuum source into the enclosure, the air mixing with mercury vapors within the enclosure and then being drawn through said aperture into the casing and thence out of said outlet.
Claim 3
Dependent Claim
29 words
An amalgamator according to claim 1 wherein said lid when closed engages said casing in a loose fitting manner to provide for said air inlet means around the lid.
Claim 4
Dependent Claim
50 words
An amalgamator according to claim 1, wherein said air inlet means and said aperture are disposed at opposite sides of said enclosure with the capsule holder therebetween, whereby air drawn in through the inlet means flows around a capsule held by the capsule holder before passing out through said aperture.
Claim 5
Dependent Claim
31 words
An amalgamator according to claim 1, wherein said enclosure has a concave base with a drain hole for spilled mercury at its lowest point, said drain hole communicating with said outlet.
Claim 6
Dependent Claim
24 words
An amalgamator according to claim 4, wherein said drain hole is located directly above said outlet when the amalgamator is in its normal position.
Claim 7
Dependent Claim
47 words
An amalgamator according to claim 1, wherein said casing has a recessed area suitable for receiving a mercury dispenser, said recessed area having a drainage hole through which any drops of mercury from said dispenser may pass, said drainage hole communicating with the outlet from the casing.
Claim 8
Dependent Claim
31 words
Dental amalgamator apparatus comprising an amalgamator according to claim 1, and further comprising a vacuum pump and a filter medium for mercury vapor disposed between said vacuum pump and said aperture.
Claim 9
Dependent Claim
68 words
Apparatus according to claim 7, wherein said casing communicates with said enclosure and has an outlet in the bottom thereof, and wherein said vacuum pump is located in a stand arranged to support said casing, the outlet of the casing being adapted to seal against the top inlet end of a mercury vapor filter held by said stand and having its outlet end connected with said vacuum pump.
Claim 10
Dependent Claim
30 words
Apparatus as claimed in claim 8, said casing provided with control means for controlling said amalgamator and said vacuum pump accessible when said lid is moved to its closed position.
Claim 11
Dependent Claim
19 words
Apparatus as claimed in claim 9, said control means automatically operating said vacuum pump whenever said amalgamator is operated.
Claim 12
Dependent Claim
33 words
Apparatus as claimed in claim 10, provided with switch means between said lid and said casing, said switch means preventing the operation of said amalgamator when said lid is in its open position.
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |