US3774023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flashlight
Assignee: Braun GmbH
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Filing: 1972-06-28
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Granted: 1973-11-20
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Expires: 1992-06-28
Abstract
Abstract A pocket size flashlight comprising a reflector having at least a pair of effective reflecting regions each having a different focal length but a common focal point, a light source placed in the focal point, the reflecting regions each forming a parabolic mirror, the reflector also including non-reflecting regions, additional reflectors having a focal point and being disposed to eliminate the non-reflecting effect.
Inventors
- 👤 C Cobarg
- 👤 R Napierski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:15
CPC Classifications
F; F21; F21L; F21L2/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
230 words
In a flashlight having a two-piece housing assembled of a convex bottom piece and an annular top piece, a convex cover glass connected to said annular top piece, the combination comprising a recess defined in the central portion of the inner surface of said cover glass, resilient electrical contact means arranged near a central portion of said bottom piece, the connection line of the centers of said opposite central portions defining the optical axis of said flashlight, the rim of said recess being adapted for contacting a bulb portion of a lamp and said contact means being adapted for electrically connecting said lamp to a power source and for urging the base of said lamp in the direction toward said recess, said lamp defining a light source point on said axis, at least a pair of annular parabolic mirrors concentrically arranged at a spaced relation from each other around said axis, each of said mirrors having a different focal length and a common focal point coinciding with said light source, at least one annular nonreflecting surface extending between said parabolic mirrors in the direction of light rays from said light source, reflecting rings concentrically arranged around said recess on said inner surface of said convex cover glass so as to reflect light rays from said light source into the shadow zones on said cover glass caused by said nonreflecting surface.
Claim 2
Dependent Claim
230 words
In a flashlight having a two-piece housing assembled of a convex bottom piece and an annular top piece, a convex cover glass connected to said annular top piece, the combination comprising a recess defined in the central portion of the inner surface of said cover glass, resilient electrical contact means arranged near a central portion of said bottom piece, the connection line of the centers of said opposite central portions defining the optical axis of said flashlight, the rim of said recess being adapted for contacting a bulb portion of a lamp and said contact means being adapted for electrically connecting said lamp to a power source and for urging the base of said lamp in the direction toward said recess, said lamp defining a light source point on said axis, at least a pair of annular parabolic mirrors concentrically arranged at a spaced relation from each other around said axis, each of said mirrors having a different focal length and a common focal point coinciding with said light source, at least one annular nonreflecting surface extending between said parabolic mirrors in the direction of light rays from said light source, reflecting rings concentrically arranged around said recess on said inner surface of said convex cover glass so as to reflect light rays from said light source into the shadow zones on said cover glass caused by said nonreflecting surface.
Claim 3
Dependent Claim
186 words
A pocket size flashlight for use in connection with a bulb having a base and a head, said flashlight including a casing having a bottom portion and a removable cover including a cover glass, and a light reflector operatively arranged within said casing spaced apart from said cover glass, comprising, in combination, bulb receiving means secured to said bottom portion of said casing and being adapted to receive the base of said bulb, said cover glass being adapted to be in contact with said bulb head, whereby said bulb will be adapted to be held iN a fixed position between said cover glass and said bulb receiving means, said reflector having at least a pair of effective reflecting regions, each of said regions having a different focal length and a common focal point, the center of said bulb head being placed in said focal point, said reflecting regions being formed as parabolic mirrors, said reflector including nonreflecting region means, additional reflector means having a focal point, said additional reflector means being disposed in relation to said nonreflecting region means to substantially eliminate the nonreflecting effect thereof.
Claim 4
Dependent Claim
186 words
A pocket size flashlight for use in connection with a bulb having a base and a head, said flashlight including a casing having a bottom portion and a removable cover including a cover glass, and a light reflector operatively arranged within said casing spaced apart from said cover glass, comprising, in combination, bulb receiving means secured to said bottom portion of said casing and being adapted to receive the base of said bulb, said cover glass being adapted to be in contact with said bulb head, whereby said bulb will be adapted to be held iN a fixed position between said cover glass and said bulb receiving means, said reflector having at least a pair of effective reflecting regions, each of said regions having a different focal length and a common focal point, the center of said bulb head being placed in said focal point, said reflecting regions being formed as parabolic mirrors, said reflector including nonreflecting region means, additional reflector means having a focal point, said additional reflector means being disposed in relation to said nonreflecting region means to substantially eliminate the nonreflecting effect thereof.
Claim 5
Dependent Claim
14 words
The flashlight as claimed in claim 2, wherein said parabolic mirrors are annularly shaped.
Claim 6
Dependent Claim
14 words
The flashlight as claimed in claim 2, wherein said parabolic mirrors are stripe shaped.
Claim 7
Dependent Claim
13 words
The flashlight as claimed in claim 3, wherein said parabolic mirrors comprise segments.
Claim 8
Dependent Claim
13 words
The flashlight as claimed in claim 4, wherein said parabolic mirrors comprise segments.
Claim 9
Dependent Claim
16 words
The flashlight as claimed in claim 2, wherein said parabolic mirrors form a single reflector structure.
Claim 10
Dependent Claim
23 words
The flashlight as claimed in claim 2, further comprising cover glass means, said additional reflector means being formed on said cover glass means.
Claim 11
Dependent Claim
24 words
The flash light as claimed in claim 2, further comprising cover glass means, said additional reflector means being secured to said cover glass means.
Claim 12
Dependent Claim
14 words
The flashlight as claimed in claim 8, Wherein said additional reflector means is annular.
Claim 13
Dependent Claim
19 words
The flashlight as claimed in claim 2, further comprising a source of power and means for recharging said source.
Claim 14
Dependent Claim
21 words
The flashlight as claimed in claim 11, wherein said recharging means comprises solar cell means disposed adjacent said nonreflecting region means.
Claim 15
Dependent Claim
14 words
The flashlight as claimed in claim 2, wherein said flashlight has a disc shape.
Claim 16
Dependent Claim
14 words
The flashlight as claimed in claim 2, having a diameter of about 6.5 cm.
Claim 17
Dependent Claim
24 words
The flashlight as claimed in claim 2, further comprising cover glass means including means for securing said light source in a central portion thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |