US4307439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp
Assignee: Individual
•
Filing: 1979-12-21
•
Granted: 1981-12-22
•
Expires: 1999-12-21
Abstract
Abstract A lamp including a supply housing, means for supporting a bulb connectible to a power supply within the housing, a head of clear transparent material mounted on the housing, and a reflector mounted within the head and having a concave inner surface for reflecting light from the bulb along an axis, the head affording clear visibility of the exterior surface of the reflector.
Inventors
- 👤 Knut O. Sassmannshausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:16
CPC Classifications
F; F21; F21L; F21L4/00; F21L4/005; F21L2/00; F21V; F21V13/00; F21V13/02; F21V13/04; F21V13/045; F21V5/00; F21V5/04; F21V7/00; F21V7/04; F21V7/09
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
A lamp comprising a battery housing, means for supporting a filament light bulb connectible to at least one cell within said battery housing, a head of clear transparent material mounted on said housing, and a reflector mounted within said head and having an exterior convex surface and a concave inner surface for reflecting light from the bulb along an exis, said head affording clear visibility of said exterior convex surface of said reflector, said head and said light bulb being axially movable relative to one another to an extent that at least part of the filament of said light bulb is withdrawn from within said concave inner surface of said reflector and light from said light bulb passes laterally through said head formed of transparent material.
Claim 2
Dependent Claim
126 words
A lamp comprising a battery housing, means for supporting a filament light bulb connectible to at least one cell within said battery housing, a head of clear transparent material mounted on said housing, and a reflector mounted within said head and having an exterior convex surface and a concave inner surface for reflecting light from the bulb along an exis, said head affording clear visibility of said exterior convex surface of said reflector, said head and said light bulb being axially movable relative to one another to an extent that at least part of the filament of said light bulb is withdrawn from within said concave inner surface of said reflector and light from said light bulb passes laterally through said head formed of transparent material.
Claim 3
Dependent Claim
23 words
A lamp according to claim 1, wherein said housing is cylindrical and said head comprises a cylindrical sleeve fitting closely on the housing.
Claim 4
Dependent Claim
21 words
A lamp according to claim 1, wherein said head comprises a frustoconical portion, said reflector being mounted within said frustoconical portion.
Claim 5
Dependent Claim
29 words
A lamp according to claim 3, wherein said reflector is a surface of revolution having a mouth, said mouth being located at the wide end of said frustoconical portion.
Claim 6
Dependent Claim
25 words
A lamp according to claim 1 wherein said head is of varying width and is formed with a non-circular section at the widest region thereof.
Claim 7
Dependent Claim
12 words
A lamp according to claim 5, wherein said non-circular section is polygonal.
Claim 8
Dependent Claim
33 words
A lamp according to claim 1 comprising a bulb supported in said bulb supporting means, said bulb having an integral converging lens for directing a beam along said axis independently of said reflector.
Claim 9
Dependent Claim
75 words
A lamp according to claim 1, comprising a bulb mounted in said bulb supporting means, said bulb extending through a central hole formed in said reflector which is of sufficient size to allow light from said bulb to pass therethrough out of said reflector, at least one of an end surface of said housing and of said bulb supporting means being a reflecting surface to reflect light from said bulb passing through said central hole.
Claim 10
Dependent Claim
18 words
A lamp according to claim 8, wherein said end surface is the end surface of said supply housing.
Claim 11
Dependent Claim
36 words
A lamp according to claim 1, wherein the exterior surface of the reflector is visible in all directions around said head except where obscured by at least one of said bulb supporting means and said housing.
Claim 12
Dependent Claim
18 words
A lamp according to claim 1, wherein at least part of said head of transparent material is colored.
Claim 13
Dependent Claim
21 words
A lamp according to claim 1, wherein said reflector is adapted specularly to reflect light falling on the exterior surface thereof.
Claim 14
Dependent Claim
23 words
A lamp according to claim 12, wherein said reflector is formed of transparent material coated with reflective material on the concave surface thereof.
Claim 15
Dependent Claim
24 words
A lamp according to claim 13, wherein said concave inner surface of said reflector is formed with a multiplicity of reflecting curved surface portions.
Claim 16
Dependent Claim
16 words
A lamp according to claim 1 wherein said exterior surface of said reflector is specularly reflecting.
Claim 17
Dependent Claim
26 words
A lamp according to claim 15 wherein said exterior surface of said reflector is convex and is formed with a multiplicity of reflecting curved surface portions.
Claim 18
Dependent Claim
30 words
A lamp according to claim 14 wherein said curved surface portions are convexities and have a height equal to from 3% to 25% of the mean smallest base diameter thereof.
Claim 19
Dependent Claim
30 words
A lamp according to claim 16 wherein said curved surface portions are concavities and have a height equal to from 3% to 25% of the mean smallest base diameter thereof.
References Cited (Backward Citations)
US2092590A
Cited
US2253952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |