Patent US3840734A successfully refreshed from Google Patents.
US3840734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting devices
Assignee: Individual
•
Filing: 1973-10-17
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Granted: 1974-10-08
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Expires: 1993-10-17
Abstract
Abstract A sealed lighting device embodies a tungsten-halogen lamp providing high-intensity light. The device includes sealing and insulating means and novel cooling means enabling the lamp to be safely used in environments where it may be drenched with oil or other liquids and foreign matter and the exterior surfaces of the device are cool enough to prevent oil from congealing thereon.
Inventors
- 👤 J Oram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:24
CPC Classifications
F; F21; F21V; F21V29/00; F21V29/50; F21V29/70; F21V29/74; F21V29/76; F21V29/767; F21V29/75; F21V29/85; F21V29/89
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A lighting device, comprising a main housing cast in metal with cooling fins therein, a cup-shaped reflector mounted in a cup-shaped cavity in the reflector, a glass cover-plate sealed over the mouths of the cavity and reflector, a tuNgsten-halogen electric lamp mounted in the housing and projecting through an aperture in the rear of the reflector with the filament of the lamp at the focus of the reflector, a ceramic ring mounted in a bore in the metal housing and in heat-conducting contact therewith, a metal ring closely fitting a bore in the ceramic ring, a flange on the lamp in close contact with the said metal ring, a spring urging the said lamp, flange, metal ring and ceramic ring forwardly to the position in which the said filament is at the said focus, a cover-plate sealed over the rear of the housing, and a supply cable sealed through an entry into the housing.
Claim 2
Dependent Claim
154 words
A lighting device, comprising a main housing cast in metal with cooling fins therein, a cup-shaped reflector mounted in a cup-shaped cavity in the reflector, a glass cover-plate sealed over the mouths of the cavity and reflector, a tuNgsten-halogen electric lamp mounted in the housing and projecting through an aperture in the rear of the reflector with the filament of the lamp at the focus of the reflector, a ceramic ring mounted in a bore in the metal housing and in heat-conducting contact therewith, a metal ring closely fitting a bore in the ceramic ring, a flange on the lamp in close contact with the said metal ring, a spring urging the said lamp, flange, metal ring and ceramic ring forwardly to the position in which the said filament is at the said focus, a cover-plate sealed over the rear of the housing, and a supply cable sealed through an entry into the housing.
Claim 3
Dependent Claim
21 words
A lighting device as claimed in claim 1, wherein the cooling fins on said housing are circumferential relative to said cavity.
Claim 4
Dependent Claim
26 words
A lighting device as claimed in claim 1, wherein the bore in said ceramic ring has a step therein and said metal ring abuts said step.
Claim 5
Dependent Claim
67 words
A lighting device as claimed in claim 1, wherein said cable entry includes a sleeve integral with said cast metal housing, a tubular spigot in said sleeve, and an elastomeric sealing device at the inner end of said spigot, said cable passing through said spigot and said sealing device and said sealing device sealing said cable relative to said spigot and said spigot relative to said sleeve.
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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |