US3666939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadeless dental light
Assignee: J Morita Manufaturing Corp
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Filing: 1971-03-19
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Granted: 1972-05-30
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Expires: 1991-03-19
Abstract
Abstract A shadeless dental light the reflector of which comprises a plurality of section mirrors arranged side by side along an elliptical arc. Each of the component section mirrors has a reflecting surface which is plain in transverse section and has a central portion of the length thereof fromed into a circular arc and portions extending from the opposite ends of the length of the central portion formed into a circular arc having a different radius of curvature than that of the central portion.
Inventors
- 👤 Sadayasu Ota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
93 words
A shadeless dental light comprising a lamp and a reflector disposed at the back of said lamp and comprising a plurality of section mirrors arranged side by side along an elliptical arc, each said section mirror having a reflecting surface which is plain in transverse section and which has a central portion of the length thereof formed into a circular arc and portions extending from the opposite ends of the length of said central portion and formed into a circular arc having a different radius of curvature from that of said central portion.
Claim 2
Dependent Claim
93 words
A shadeless dental light comprising a lamp and a reflector disposed at the back of said lamp and comprising a plurality of section mirrors arranged side by side along an elliptical arc, each said section mirror having a reflecting surface which is plain in transverse section and which has a central portion of the length thereof formed into a circular arc and portions extending from the opposite ends of the length of said central portion and formed into a circular arc having a different radius of curvature from that of said central portion.
Claim 3
Dependent Claim
23 words
The dental light of claim 1, wherein the radius of curvature of said opposite portions are less than that of said central portion.
References Cited (Backward Citations)
US2437516A
Cited
US3511983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |