Patent US4524410A successfully refreshed from Google Patents.
US4524410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incandescent lamp with film of alternately stacked layers
Assignee: Toshiba Corp
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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 13:54
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.
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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) | 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 |