US4125890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parabolic reflector including filament locating means
Assignee: Corning Glass Works
•
Filing: 1976-12-10
•
Granted: 1978-11-14
•
Expires: 1996-12-10
Abstract
Abstract A generally concave reflector member is provided with three or more bosses having flat outer surfaces. The surfaces define a plane perpendicular to the axis of the parabola so that specific points within the parabola can be located with great precision. By using the bosses as reference points, lamp filaments can be accurately placed within the lamp structure, regardless of variations in the reflector member which occur during the manufacturing process.
Inventors
- 👤 Roy A. Nixon, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:11
CPC Classifications
H; H01; H01K; H01K9/00; H01K9/08; H01K1/00; H01K1/28; H01K1/32; H01K1/325
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A concave reflector for a sealed-beam incandescent lamp, said reflector having an inner surface exhibiting a cross-section approximating a parabola, and including at least three discrete, upstanding bosses having surfaces defining a plane substantially perpendicular to the axis of the parabola, said bosses enabling accurate mounting of a filament of said lamp at a predetermined position with respect to the latus rectum of the lamp.
Claim 2
Dependent Claim
65 words
A concave reflector for a sealed-beam incandescent lamp, said reflector having an inner surface exhibiting a cross-section approximating a parabola, and including at least three discrete, upstanding bosses having surfaces defining a plane substantially perpendicular to the axis of the parabola, said bosses enabling accurate mounting of a filament of said lamp at a predetermined position with respect to the latus rectum of the lamp.
Claim 3
Dependent Claim
22 words
A concave reflector member according to claim 1, wherein said plane defined by said bosses comprises the latus rectum of the parabola.
Claim 4
Dependent Claim
18 words
A concave reflector member according to claim 1, wherein said bosses comprise members upstanding from said inner surface.
Claim 5
Dependent Claim
29 words
A concave reflector member according to claim 3, wherein said reflector member has a generally circular periphery, and wherein said bosses are disposed approximately 120° apart within said member.
Claim 6
Dependent Claim
30 words
A reflector member according to claim 3, wherein said reflector member terminates in a generally rectangular periphery, and wherein said bosses are disposed adjacent the corners of said rectangular periphery.
Claim 7
Dependent Claim
132 words
A concave reflector member for a sealed-beam incandescent lamp, said reflector member being generally concave in form and having outer and inner surfaces, said member being adapted to receive a filament assembly therein, said inner surface exhibiting a substantially parabolic cross-sectional profile in at least one plane, and forming spread light and light concentration areas for respectively dispersing and concentrating light emitted by the filament assembly, said member comprising at least three discrete, generally flat locating bosses formed in said inner surface for enabling accurate mounting of the filament assembly with reference to the latus rectum of said reflector member, said bosses being spaced from one another to define a plane extending generally perpendicular to the axis of the parabola, said bosses being disposed in spread light areas of said reflector member.
Claim 8
Dependent Claim
132 words
A concave reflector member for a sealed-beam incandescent lamp, said reflector member being generally concave in form and having outer and inner surfaces, said member being adapted to receive a filament assembly therein, said inner surface exhibiting a substantially parabolic cross-sectional profile in at least one plane, and forming spread light and light concentration areas for respectively dispersing and concentrating light emitted by the filament assembly, said member comprising at least three discrete, generally flat locating bosses formed in said inner surface for enabling accurate mounting of the filament assembly with reference to the latus rectum of said reflector member, said bosses being spaced from one another to define a plane extending generally perpendicular to the axis of the parabola, said bosses being disposed in spread light areas of said reflector member.
Claim 9
Dependent Claim
20 words
A reflector member according to claim 6, wherein said bosses comprise inwardly-directed, upstanding elements terminating in substantially coplanar flat surfaces.
Claim 10
Dependent Claim
30 words
A reflector member according to claim 7, wherein said member terminates in a substantially circular periphery and said bosses are disposed in a common, annular locus within said reflector member.
Claim 11
Dependent Claim
16 words
A reflector member according to claim 7, wherein said member terminates in a generally rectangular periphery.
Claim 12
Dependent Claim
34 words
A reflector member according to claim 9, wherein said member is provided with four locating bosses, each of said bosses disposed adjacent a corner of the rectangle defined by the periphery of the member.
References Cited (Backward Citations)
US2026919A
Cited
US2121310A
Cited
US3553705A
Cited
US3621232A
Cited
US3824013A
Cited
US3827782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |