US4766346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp with low-toxicity, molybdenum-compatible sealing glass
Assignee: Osram GmbH
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Filing: 1987-04-27
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Granted: 1988-08-23
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Expires: 2007-04-27
Abstract
Abstract To provide a melt glass (10) to seal capillary spaces (9) surrounding external current supply leads (8) of molybdenum passing to molybdenum foils (6) in a pinch or press seal (7) of a high temperature, for example incandescent halogen lamp, the melt glass (10) is made of 3-10% Bi 2 O 3 , 25%-40% B 2 O 3 , remainder PbO. The melt glass has low toxicity and is molybdenum-compatible. An additive of barium oxide, in up to 15% and preferably up to only about 10%, may be added to the PbO. All quantities in mol-percent.
Inventors
- 👤 Werner Weiss
- 👤 Ewald Posl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/38
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
137 words
An electric lamp having a bulb (2) of high-temperature-resistant glass; light generating means (4) located within the bulb; a fill within the bulb; a pinch or press seal (7) closing off at least one end of the bulb, vacuum-tight, with respect to outside ambient atmosphere; external current supply leads (8) passed into the pinch or press seal; foil means (6) electrically connected to internal current supply leads (5) and connected to the external leads (8), and sealed into the pinch or press seal; and a lead borate sealing glass (10) filling capillary spaces (9) which occur adjacent the external current supply leads (8) leading to the foil means (6), wherein the sealing glass (10) has the following composition: 3-10% Bi 2 O 3 , 25-40% B 2 O 3 , remainder primarily PbO, all in mol percent.
Claim 2
Dependent Claim
137 words
An electric lamp having a bulb (2) of high-temperature-resistant glass; light generating means (4) located within the bulb; a fill within the bulb; a pinch or press seal (7) closing off at least one end of the bulb, vacuum-tight, with respect to outside ambient atmosphere; external current supply leads (8) passed into the pinch or press seal; foil means (6) electrically connected to internal current supply leads (5) and connected to the external leads (8), and sealed into the pinch or press seal; and a lead borate sealing glass (10) filling capillary spaces (9) which occur adjacent the external current supply leads (8) leading to the foil means (6), wherein the sealing glass (10) has the following composition: 3-10% Bi 2 O 3 , 25-40% B 2 O 3 , remainder primarily PbO, all in mol percent.
Claim 3
Dependent Claim
15 words
The lamp of claim 1, wherein the remainder comprises PbO and an additive of BaO.
Claim 4
Dependent Claim
16 words
The lamp of claim 2, wherein the BaO additive is present in up to 15-mol %.
Claim 5
Dependent Claim
34 words
The lamp of claim 1, wherein the composition of the sealing glass essentially consists of: 4-6% Bi 2 O 3 , 33-37% B 2 O 3 , remainder primarily PbO all in mol percent.
Claim 6
Dependent Claim
27 words
The lamp of claim 1, wherein the sealing glass consists essentially of about: 35% B 2 O 3 , 5% Bi 2 O 3 , 60% PbO.
Claim 7
Dependent Claim
29 words
The lamp of claim 2, wherein the sealing glass consists essentially of about: 30% B 2 O 3 , 8% Bi 2 O 3 , 10% BaO, 52% PbO.
Claim 8
Dependent Claim
29 words
The lamp of claim 2, wherein the sealing glass consists essentially of about: 35% B 2 O 3 , 5% Bi 2 O 3 , 10% BaO, 50% PbO.
Claim 9
Dependent Claim
16 words
The lamp of claim 2, wherein the BaO additive is present in up to 10-mol %.
Claim 10
Dependent Claim
11 words
The lamp of claim 1, wherein the fill contains a halogen.
Claim 11
Dependent Claim
13 words
The lamp of claim 1, wherein the lamp is a halogen incandescent lamp.
Claim 12
Dependent Claim
14 words
The lamp of claim 1, wherein the lamp is a halogen high-pressure discharge lamp.
Claim 13
Dependent Claim
26 words
The lamp of claim 1, wherein the lamp operates at a temperature such that the pinch or press seal, in operation, is over about 350° C.
Claim 14
Dependent Claim
21 words
The lamp of claim 1, wherein said foil means (6) and said external current supply leads (8) consist essentially of molybdenum.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |