Patent US4460340A successfully refreshed from Google Patents.
US4460340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receptacle for dental amalgam
Assignee: MARVIN M STARK RESEARCH FOUNDATION A CA NONPROFIT CORP
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Filing: 1983-01-21
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Granted: 1984-07-17
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Expires: 2003-01-21
Abstract
Abstract For use in reducing atmospheric contamination by mercury vapor from an amalgam container, there is provided a rigid tube hooked over the rim of the container and open to the interior thereof. The duct is connected through a filter for taking out the noxious material to a vacuum source.
Inventors
- 👤 Marvin M. Stark
- 👤 Kenneth B. Soelberg
- 👤 Roger B. Pelzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:57
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/60; A61C5/68; A61C19/00; A61C19/007
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
152 words
A dental amalgam device comprising an imperforate amalgam container open to the atmosphere within a top rim and adapted to contain a liquid substance emitting noxious vapor to the atmosphere from the surface of said liquid, a duct having opposite ends and at one of said ends having a return hook extending over said rim and engaged with said rim of said receptacle, said duct hook being open at said one end to the atmosphere and being positioned to be directed downwardly just above said surface within the interior of said container in position to receive noxious vapor and air, means for connecting the other of said ends of said duct to a vacuum source for passing said noxious vapor and air through said duct, and means between said other end of said duct and said vacuum source for absorbing said noxious vapor from said passing air and for discharging said air.
Claim 2
Dependent Claim
152 words
A dental amalgam device comprising an imperforate amalgam container open to the atmosphere within a top rim and adapted to contain a liquid substance emitting noxious vapor to the atmosphere from the surface of said liquid, a duct having opposite ends and at one of said ends having a return hook extending over said rim and engaged with said rim of said receptacle, said duct hook being open at said one end to the atmosphere and being positioned to be directed downwardly just above said surface within the interior of said container in position to receive noxious vapor and air, means for connecting the other of said ends of said duct to a vacuum source for passing said noxious vapor and air through said duct, and means between said other end of said duct and said vacuum source for absorbing said noxious vapor from said passing air and for discharging said air.
Claim 3
Dependent Claim
40 words
A device as in claim 1 in which said hook is in position to extend from the outside of said receptacle, over said rim and into said receptacle, and means for fastening said tube to said receptacle in said position.
References Cited (Backward Citations)
US453628A
Cited
US602572A
Cited
US1137482A
Cited
US1159206A
Cited
US1664419A
Cited
US1896951A
Cited
FR982813A
Cited
US2788085A
Cited
US3332089A
Cited
US3559961A
Cited
US3631791A
Cited
US3880061A
Cited
US4071338A
Cited
US4061149A
Cited
US4148618A
Cited
US4197646A
Cited
SU731210A1
Cited
US4213755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |