US3706900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection filament lamp
Assignee: US Philips Corp
•
Filing: 1971-02-09
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Granted: 1972-12-19
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Expires: 1991-02-09
Abstract
Abstract An electric filament lamp for projection purposes in which the two straight ends of the filament body are incorporated in a pinch seal and are each surrounded by a member supporting said ends; said members are preferably constructed as helically wound wires of unequal lengths and are incorporated at their ends in the pinch seal.
Inventors
- 👤 Ferdinandus Maria Josephu Beek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:01
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
An electric filament lamp, in particular a halogen projection lamp, in which the current supply conductors of the filament arranged at right angles to the longitudinal direction of the lamp are secured in a pinch seal present at one end of the lamp, each of the conductors being surrounded by a member which supports said conductors and is incorporated at its one end in the pinched seal and is located at its other end in the lamp space, wherein the members supporting the relative conductors have unequal lengths calculated from the pinch seal.
Claim 2
Dependent Claim
93 words
An electric filament lamp, in particular a halogen projection lamp, in which the current supply conductors of the filament arranged at right angles to the longitudinal direction of the lamp are secured in a pinch seal present at one end of the lamp, each of the conductors being surrounded by a member which supports said conductors and is incorporated at its one end in the pinched seal and is located at its other end in the lamp space, wherein the members supporting the relative conductors have unequal lengths calculated from the pinch seal.
Claim 3
Dependent Claim
30 words
An electric filament lamp as claimed in claim 1, wherein the shorter member has a length which is between 20 and 90 percent of the length of the longer member.
Claim 4
Dependent Claim
22 words
An electric filament lamp as claimed in claim 1 or 2, wherein each member surrounds the associated current conductor with some clearance.
Claim 5
Dependent Claim
19 words
An electric filament lamp as claimed in claim 1, wherein the member is formed as a helically wound body.
References Cited (Backward Citations)
US2404992A
Cited
US2226281A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |