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US4640685A Expired / Lapsed US ⏱️ 0.0 years remaining

Hand-held light filter

Assignee: Individual
•
Filing: 1985-04-15
•
Granted: 1987-02-03
•
Expires: 2005-04-15
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Abstract

Abstract The invention discloses a protective light shield to reduce the harmful effects of resin-curing lights used in dentistry. This is a shield made principally of a single sheet of filtering plastic, shaped in a convenient paddle configuration. The dimension of the filter-paddle is sufficient to block all direct and reflected light from the tooth of the patient that would possibly be seen by any personnel in the operatory. A portion of the paddle is provided with a magnifier which may be employed by the physician for closer inspection of the tooth being operated on. Additionally, a relatively thin intensity-filtering material is applied to the back of the light paddle so that the intensity of the filtered light is reduced for the increased comfort and protection of the physician.

Inventors

  • 👤 Theodore P. Croll

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 21:02
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/02; A61F9/022; A61C; A61C19/00; A61C19/003; A61C19/004

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 64 words
A hand-held light shield device for use in dentistry, comprising: a. a main paddle element which has optical properties necessary to filter out physically harmful light, b. an intensity filter affixed to one side of said main paddle element, c. a magnifying element on said main paddle portion, and d. a light blue colored strip affixed to the end of said main panel portion.
Claim 2
Dependent Claim 64 words
A hand-held light shield device for use in dentistry, comprising: a. a main paddle element which has optical properties necessary to filter out physically harmful light, b. an intensity filter affixed to one side of said main paddle element, c. a magnifying element on said main paddle portion, and d. a light blue colored strip affixed to the end of said main panel portion.
Claim 3
Dependent Claim 23 words
The light filter described in claim 1 further including a narrowed portion of the main paddle element suitable for use as a handle.
Claim 4
Dependent Claim 18 words
The hand-held light filter, as described in claim 2, wherein the main paddle element is approximately 1/8-inch thick.
Claim 5
Dependent Claim 16 words
The light filter described in claim 3 wherein the main paddle element is made of plastic.
Claim 6
Dependent Claim 19 words
The hand-held light filter described in claim 4 wherein said intensity filter is co-extensive with said main paddle portion.
Claim 7
Dependent Claim 29 words
The hand-held light shield device as described in claim 5 wherein the main paddle portion filters out a high percentage of ultraviolet light rays in the 400-525 nanometer range.
Claim 8
Dependent Claim 29 words
The light filter, as described in claim 6, further described in that the overall dimension of said light filter is no greater than 6"×10" and no less than 4"×8".

References Cited (Backward Citations)

US1938734A Cited
US2392671A Cited
US3409348A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-02-02 1990-08-04 1991-02-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-02-02 1994-08-04 1995-02-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-02-02 1998-08-04 1999-02-03 $7700.00 Window Closed / Lapsed

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