US4522594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light shield for a dental handpiece
Assignee: PMC Inc
•
Filing: 1983-01-21
•
Granted: 1985-06-11
•
Expires: 2003-01-21
Abstract
Abstract A dental handpiece especially for transmitting intense light for use in polymerizing dental materials in situ has a readily removable opaque shield of deformable material affixed to the end thereof to preclude the light from spreading and to prevent inadvertent contact of the handpiece tip with the subjacent area.
Inventors
- 👤 Marvin M. Stark
- 👤 Kenneth B. Soelberg
- 👤 Roger B. Pelzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:29
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/003; A61C19/004; A61B; A61B90/00; A61B90/04; A61B2090/049
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A light shield for a dental handpiece having a tubular end terminating in a squared-off tip and having means for conducting light through said handpiece and to said end to discharge therefrom, comprising an annular shield collar having an inner cylindrical wall adapted to slip over said handpiece end, an annular end flange on said inner cylindrical wall adapted to abut said tubular end and defining a central opening in line with said light conducting means, an outer cylindrical wall connected to said inner cylindrical wall flange to define an annular space between said cylindrical walls, and an annular shield of spongy opaque material mounted in said annular space, said annular shield having a disc portion extending radially and axially beyond said tubular end and having a central opening therethrough in position to conduct said light coming fom said tubular end through the center of said annular shield.
Claim 2
Dependent Claim
148 words
A light shield for a dental handpiece having a tubular end terminating in a squared-off tip and having means for conducting light through said handpiece and to said end to discharge therefrom, comprising an annular shield collar having an inner cylindrical wall adapted to slip over said handpiece end, an annular end flange on said inner cylindrical wall adapted to abut said tubular end and defining a central opening in line with said light conducting means, an outer cylindrical wall connected to said inner cylindrical wall flange to define an annular space between said cylindrical walls, and an annular shield of spongy opaque material mounted in said annular space, said annular shield having a disc portion extending radially and axially beyond said tubular end and having a central opening therethrough in position to conduct said light coming fom said tubular end through the center of said annular shield.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |