US5115379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite filter and illuminating device
Assignee: Individual
•
Filing: 1990-12-31
•
Granted: 1992-05-19
•
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 02:08
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 %.
References Cited (Backward Citations)
US2062179A
Cited
GB566114A
Cited
US2479501A
Cited
US2931117A
Cited
US2816047A
Cited
US3059051A
Cited
US2831282A
Cited
US2999148A
Cited
US3193509A
Cited
US3146120A
Cited
US3241256A
Cited
US3382183A
Cited
US3826751A
Cited
US4321655A
Cited
JPS56135809A
Cited
US4453200A
Cited
US4535396A
Cited
JPS6016180A
Cited
JPS6016101A
Cited
JPS6017702A
Cited
US4616902A
Cited
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 |