US4673840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ruggedized mount structure for tungsten halogen lamp
Assignee: Osram Sylvania Inc
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Filing: 1984-06-20
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Granted: 1987-06-16
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Expires: 2004-06-20
Abstract
Abstract A tungsten-halogen lamp has a ruggedized mount structure employing tri-partite lead-in wires sealed in a soft glass stem and a hard glass capsule. Heavier intermediate sections provide support while the proximal and distal portions are different materials selected to form hermetic seals with the hard glass and soft glass.
Inventors
- 👤 Paul E. Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:32
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/34; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A tungsten-halogen incandescent lamp comprising: an inner, light transmitting, hermetically sealed, hard glass capsule of relatively small volume and having a longitudinal axis; and an outer, light transmitting, hermetically sealed, soft glass envelope of relatively large volume and having a longitudinal axis; and a mount structure of soft glass, said mount structure comprising a re-entrant stem having a first press at one end thereof and a sealing are at the opposite end thereof; a pair of lead-in wires comprised of proximal portions a hermetic seal with said first press, distal portions forming a hermetic seal with a second press in said hard glass capsule and extending internally thereof and mounting a tungsten filament, and intermediate portions connecting said proximal and distal portions, said intermediate portions having greater structural rigidity than said proximal and distal portions, said intermediate portions having a diameter from about 3 to about 5 times the diameter of said proximal and distal portions.
Claim 2
Dependent Claim
156 words
A tungsten-halogen incandescent lamp comprising: an inner, light transmitting, hermetically sealed, hard glass capsule of relatively small volume and having a longitudinal axis; and an outer, light transmitting, hermetically sealed, soft glass envelope of relatively large volume and having a longitudinal axis; and a mount structure of soft glass, said mount structure comprising a re-entrant stem having a first press at one end thereof and a sealing are at the opposite end thereof; a pair of lead-in wires comprised of proximal portions a hermetic seal with said first press, distal portions forming a hermetic seal with a second press in said hard glass capsule and extending internally thereof and mounting a tungsten filament, and intermediate portions connecting said proximal and distal portions, said intermediate portions having greater structural rigidity than said proximal and distal portions, said intermediate portions having a diameter from about 3 to about 5 times the diameter of said proximal and distal portions.
Claim 3
Dependent Claim
25 words
The lamp of claim 1 wherein said proximal portions are selected from materials having substantially the same coefficient of thermal expansion as said soft glass.
Claim 4
Dependent Claim
25 words
The lamp of claim 2 wherein said distal portions are selected from materials having substantially the same coefficient of thermal expansion as said hard glass.
Claim 5
Dependent Claim
16 words
The lamp of claim 3 wherein said distal portions are selected from molybdenum and alloys thereof.
Claim 6
Dependent Claim
17 words
The lamp of claim 4 wherein said proximal portions comprise a nickel-iron core which is copper coated.
Claim 7
Dependent Claim
47 words
The lamp of claim 5 wherein said hard glass is selected from aluminosilicate and borosilicate glasses having thermal expansion coefficient of about 58 to 32×10 -7 in/in/° C. and said soft glass is selected from soda-lime glasses having thermal expansion coefficients of about 92×10 -7 in/in/° C.
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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) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |