US4091951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamps for high powers
Assignee: US Philips Corp
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Filing: 1976-11-26
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Granted: 1978-05-30
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Expires: 1996-11-26
Abstract
Abstract A lamp, particularly for high powers, whose envelope consists of lime glass and in which in a 30μ thick surface layer Na + - and/or Li + ions are replaced by larger ions. This results in a compressive stress in the layer which is at least 7 kg/mm 2 . The envelope is as strong and resistant to temperature changes as hard glass.
Inventors
- 👤 Anthonie Louis Zijlstra
- 👤 Anton Boekkooi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C21/00; C03C21/001; C03C21/002; C03C3/083; C03C3/085; C03C3/087; C03C3/102; H; H01; H01J; H01J5/00; H01J5/02; H01J5/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A lamp characterized in that the envelope, consists of glass the composition of which lies within the range in weight % which is limited as follows: SiO 2 -- 65-85 Al 2 O 3 -- 0-3 Na 2 O --5-20 K 2 o -- 0-2 b 2 o 3 -- 0-1 caO -- 5-15 MgO -- 0-5 BaO -- 0-5 Sb 2 O 3 + As 2 O 3 -- 0-1,5 So 3 -- 0-1. where Na 2 O may be wholly or partly replaced equimolarly by Li 2 O and where the total of contaminations and coloured oxides is ≦ 2, which envelope has for a preponderating part at the surface a layer of at least 30 μm thick in which Na + - and/or Li + -ions are replaced by larger ions in such a proportion that in the layer there is a compressive stress which is at least 2000 nm/cm = approximately 7 kg/mm 2 .
Claim 2
Dependent Claim
159 words
A lamp characterized in that the envelope, consists of glass the composition of which lies within the range in weight % which is limited as follows: SiO 2 -- 65-85 Al 2 O 3 -- 0-3 Na 2 O --5-20 K 2 o -- 0-2 b 2 o 3 -- 0-1 caO -- 5-15 MgO -- 0-5 BaO -- 0-5 Sb 2 O 3 + As 2 O 3 -- 0-1,5 So 3 -- 0-1. where Na 2 O may be wholly or partly replaced equimolarly by Li 2 O and where the total of contaminations and coloured oxides is ≦ 2, which envelope has for a preponderating part at the surface a layer of at least 30 μm thick in which Na + - and/or Li + -ions are replaced by larger ions in such a proportion that in the layer there is a compressive stress which is at least 2000 nm/cm = approximately 7 kg/mm 2 .
References Cited (Backward Citations)
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US3930820A
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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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |