Patent US3899871A successfully refreshed from Google Patents.
US3899871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clock with dial illumination
Assignee: Seiko Koki KK
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Filing: 1974-05-07
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Granted: 1975-08-19
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Expires: 1994-05-07
Abstract
Abstract A clock with a dial having time-indicating indicia illuminated by rays of light as shafts of light from a central electric bulb mounted coaxial with the dial on the face of the dial. A reflector having inner surfaces that reflect the light on to the face of the dial is mounted enclosing the light source or bulb. It has openings circumferentially spaced individually in registry with a corresponding time-indicating indicium for impinging thereon respective shafts of light rays. The electrical leads to the electric bulb are connected to a socket receiving the bulb and extend through a tubular element coaxial with the dial. The electrical leads extend through this tube to the backside of the dial and through substantially the width of the clock free of interference with clock movement. The clock hands are driven by tubular shafts concentric with the central tube and are nested thereon for rotation providing a compact arrangement.
Inventors
- 👤 Kiyoshi Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:53
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of the dial and over said time indicia, means mounting said reflector, said reflector comprising angularly spaced peripheral notches on the base thereof for passing rays of light in registry with a corresponding time indicium.
Claim 2
Dependent Claim
138 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of the dial and over said time indicia, means mounting said reflector, said reflector comprising angularly spaced peripheral notches on the base thereof for passing rays of light in registry with a corresponding time indicium.
Claim 3
Dependent Claim
157 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of thE dial and over said time indicia, means mounting said reflector, said reflector being substantially hemispherical in configuration and having a base open toward the face of the dial, and said reflector comprising angularly spaced peripheral openings on the base thereof for passing rays of light in registry with a corresponding time indicium.
Claim 4
Dependent Claim
157 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of thE dial and over said time indicia, means mounting said reflector, said reflector being substantially hemispherical in configuration and having a base open toward the face of the dial, and said reflector comprising angularly spaced peripheral openings on the base thereof for passing rays of light in registry with a corresponding time indicium.
Claim 5
Dependent Claim
144 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of the dial and over said time indicia, means mounting said reflector, said means mounting said reflector comprising a transparent plate between the reflector and the dial enclosing said dial in said case and disposed for viewing said time indicia therethrough.
Claim 6
Dependent Claim
144 words
A clock comprising, a case, a dial internally thereof having time indicia on a face thereof, a tubular element coaxial with the dial and extending axially rearwardly of the backside of the dial, an electric bulb socket mounted coaxial with said tubular element forwardly of the face of the dial for receiving an electric bulb therein, electrical lead connections to said socket extending through said tubular element to said socket and out of a rear end of said tubular element, a reflector spaced from said socket and having inner surfaces for reflecting light from said bulb rearwardly of the reflector onto said face of the dial and over said time indicia, means mounting said reflector, said means mounting said reflector comprising a transparent plate between the reflector and the dial enclosing said dial in said case and disposed for viewing said time indicia therethrough.
Claim 7
Dependent Claim
28 words
A clock according to claim 3, in which said transparent plate comprises projections thereon arranged coaxial with said socket spaced from each other and removably mounting said reflector.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |