Patent US3586848A successfully refreshed from Google Patents.
US3586848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminated clock
Assignee: Individual
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Filing: 1968-11-26
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Granted: 1971-06-22
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Expires: 1988-11-26
Abstract
Abstract An illuminated clock specifically for use in a photographic darkroom or similar confines, where protection against certain light rays is of necessity, composed of a housing including an illuminated time dial provided with means to interchangeably mount light ray absorbing filters within the housing in front of the illuminated dial to screen out and dampen the radiation of optical wavelengths emanating from the illuminated dial.
Inventors
- 👤 William H Loftis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:02
CPC Classifications
G; G04; G04B; G04B19/00; G04B19/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
190 words
An illuminated clock device for use in a photographic dark room comprising a lightproof housing open at one end, an electrical light source in said housing for emitting light rays, said light source mounted on a reflector shield, at least one shield of transparent material disposed in said housing forwardly of said light source, a clock mechanism mounted behind said reflector shield and including a shaft extending through said reflector shield and through said transparent shield, a clock dial formed on said transparent shield and clock hands mounted to said shaft in front of said clock dial, filter means mounted to said housing in front of said clock dial for absorbing optical wave lengths harmful to photographic film, said filter means including screw threads formed on the exterior surface of said housing, a removable screw cap adapted to engage said screw threads, retaining means providEd on said screw caps, and a light filter adapted to placed in said screw cap against the retaining means so that said filter is clamped between said retaining means and said open end of said housing upon tightening of said screw cap upon said housing.
Claim 2
Dependent Claim
190 words
An illuminated clock device for use in a photographic dark room comprising a lightproof housing open at one end, an electrical light source in said housing for emitting light rays, said light source mounted on a reflector shield, at least one shield of transparent material disposed in said housing forwardly of said light source, a clock mechanism mounted behind said reflector shield and including a shaft extending through said reflector shield and through said transparent shield, a clock dial formed on said transparent shield and clock hands mounted to said shaft in front of said clock dial, filter means mounted to said housing in front of said clock dial for absorbing optical wave lengths harmful to photographic film, said filter means including screw threads formed on the exterior surface of said housing, a removable screw cap adapted to engage said screw threads, retaining means providEd on said screw caps, and a light filter adapted to placed in said screw cap against the retaining means so that said filter is clamped between said retaining means and said open end of said housing upon tightening of said screw cap upon said housing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |