US4524410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent lamp with film of alternately stacked layers
Assignee: Toshiba Corp
•
Filing: 1983-09-23
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Granted: 1985-06-18
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Expires: 2003-09-23
Abstract
Abstract An incandescent lamp has a bulb with a built-in filament therein, and an infrared ray reflection film formed on one or both of the outer and inner surfaces of the bulb and containing a non-crystalline metal oxide. The infrared ray reflection film is excellent in transmittance of visible rays and in reflectance of infrared rays and does not cause separation.
Inventors
- 👤 Akira Kawakatsu
- 👤 Fumio Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:48
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
72 words
An incandescent lamp comprising: a glass bulb having a built-in filament; and a transparent film formed on at least one surface of said bulb, said transparent film having a structure containing at least three layers wherein a first layer comprising a non-crystalline metal oxide and having a first reflectivity and a second layer comprising a metal oxide and having a second reflectivity which is different from said first reflectivity are alternately stacked.
Claim 2
Dependent Claim
72 words
An incandescent lamp comprising: a glass bulb having a built-in filament; and a transparent film formed on at least one surface of said bulb, said transparent film having a structure containing at least three layers wherein a first layer comprising a non-crystalline metal oxide and having a first reflectivity and a second layer comprising a metal oxide and having a second reflectivity which is different from said first reflectivity are alternately stacked.
Claim 3
Dependent Claim
23 words
An incandescent lamp according to claim 1, wherein said first layer comprises not less than about 50% by weight of non-crystalline titanium dioxide.
Claim 4
Dependent Claim
20 words
An incandescent lamp according to claim 2, wherein said metal oxide forming said second layer is a non-crystalline metal oxide.
Claim 5
Dependent Claim
16 words
An incandescent lamp according to claim 3, wherein said second layer is formed of non-crystalline silicon.
References Cited (Backward Citations)
GB653323A
Cited
GB797886A
Cited
GB822757A
Cited
GB863351A
Cited
GB923787A
Cited
GB966344A
Cited
GB1210757A
Cited
US3909649A
Cited
AU2126977A
Cited
GB1571194A
Cited
AU3409078A
Cited
GB1582685A
Cited
GB1602771A
Cited
AU4285878A
Cited
GB2043997A
Cited
US4366407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |