Patent US5115379A successfully refreshed from Google Patents.
US5115379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite filter and illuminating device
Assignee: Individual
•
Filing: 1990-12-31
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Granted: 1992-05-19
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Expires: 2010-12-31
Abstract
Abstract A composite filter advantageously employable for dark field observation systems which comprises a dyed organic resin layer provided on a dyed glass plate. The organic resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of light at 650 nm is defined to a level of 1×10 -4 % to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %. Another dyed glass plate which shows an absorption spectrum having absorption peaks in regions of 480-535 nm and 560-600 nm may be incorporated into the composite filter. The composite filter can be introduced into or provided to an illuminating device.
Inventors
- 👤 Kiyoshi Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:51
CPC Classifications
G; G01; G01D; G01D11/00; G01D11/28; G12; G12B; G12B11/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A composite filter comprising a dyed organic resin layer provided on a dyed glass plate, wherein the resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of orange-red light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %.
Claim 2
Dependent Claim
83 words
A composite filter comprising a dyed organic resin layer provided on a dyed glass plate, wherein the resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of orange-red light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %.
Claim 3
Dependent Claim
18 words
The composite filter as claimed in claim 1, wherein the glass plate is colored with a cobalt-containing compound.
Claim 4
Dependent Claim
110 words
A composite filter comprising a first dyed glass plate, a dyed organic resin layer and a second dyed glass plate, wherein the resin layer and the first glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of orange-red light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %, and the second dyed glass plate has an absorption spectrum having absorption peaks in regions of 480-535 nm and 560-600 nm.
Claim 5
Dependent Claim
110 words
A composite filter comprising a first dyed glass plate, a dyed organic resin layer and a second dyed glass plate, wherein the resin layer and the first glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of orange-red light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %, and the second dyed glass plate has an absorption spectrum having absorption peaks in regions of 480-535 nm and 560-600 nm.
Claim 6
Dependent Claim
19 words
The composite filter as claimed in claim 3, wherein the first glass plate is colored with a cobalt-containing compound.
Claim 7
Dependent Claim
19 words
The composite filter as claimed in claim 3, wherein the second glass plate is colored with a neodymium-containing compound.
Claim 8
Dependent Claim
117 words
In an illuminating device comprising an incandescent lamp and a transparent casing which encases said lamp, the improvement wherein a wall portion of said casing surrounding a side portion of the lamp is comprises a composite filter comprising a dyed organic resin layer provided on a dyed glass plate in which the resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %.
Claim 9
Dependent Claim
117 words
In an illuminating device comprising an incandescent lamp and a transparent casing which encases said lamp, the improvement wherein a wall portion of said casing surrounding a side portion of the lamp is comprises a composite filter comprising a dyed organic resin layer provided on a dyed glass plate in which the resin layer and the glass plate in combination absorb light of a radiation spectrum in the region of longer than 600 nm under the condition that the transmission of light at 650 nm is defined to a level in the range of 1×10 -3 to 5% and the transmission of light at 800 nm is defined to a level of lower than 2×10 -5 %.
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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) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |