Patent US3949259A successfully refreshed from Google Patents.
US3949259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-transmitting, thermal-radiation reflecting filter
Assignee: US Philips Corp
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Filing: 1974-08-09
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Granted: 1976-04-06
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Expires: 1994-08-09
Abstract
Abstract A light-transmitting, thermal-radiation reflecting filter which comprises a transparent support coated with indium oxide which is doped with more than 7 atomic percent of tin, calculated with respect to the number of indium atoms, has a free-electron density between 10 21 and 3 times 10 21 per cm 3 and a plasma wavelength of less than 1.2μm. The filter can be manufactured so as to have a stress-free support by heating a support, which is coated in known manner with tin-doped indium oxide, at a temperature between 300°C and the softening temperature of the support material in a gas having an oxygen partial pressure of less than 10.sup. -7 atmosphere.
Inventors
- 👤 Heiner Kostlin
- 👤 Rudiger Jost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:50
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/208; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/40
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
In a light-transmitting, thermal-radiation reflecting filter of the type comprising a light-transmitting support which is coated with tin-doped indium oxide, the improvement wherein the indium oxide contains more than 7 atomic per cent of tin, calculated with respect to the number of indium atoms, has a free-electron density between 10 21 and 3 times 10 21 per cm 3 and a plasma wavelength of less than 1.2 μm.
Claim 2
Dependent Claim
68 words
In a light-transmitting, thermal-radiation reflecting filter of the type comprising a light-transmitting support which is coated with tin-doped indium oxide, the improvement wherein the indium oxide contains more than 7 atomic per cent of tin, calculated with respect to the number of indium atoms, has a free-electron density between 10 21 and 3 times 10 21 per cm 3 and a plasma wavelength of less than 1.2 μm.
Claim 3
Dependent Claim
32 words
The filter as claimed in claim 1, wherein the indium oxide contains between 7 atomic percent and 20 atomic per cent of tin, calculated with respect to the number of indium atoms.
Claim 4
Independent Claim
100 words
A method of manufacturing a light-transmitting, heat-radiation reflecting filter comprising coating a light-transmitting support with indium oxide doped with more than 7 atomic per cent of tin, calculated with respect to the number of indium atoms, heating the coated support in a gas containing an oxygen partial pressure of less than 10 7 atmosphere and at a temperature between 300°C and the softening temperature of the support, whereby a heat filter having a plasma wavelength of less than 1.2 μm and a free-electron density between 10 21 and 3 times 10 21 per cm 3 on the support is obtained.
Claim 5
Independent Claim
100 words
A method of manufacturing a light-transmitting, heat-radiation reflecting filter comprising coating a light-transmitting support with indium oxide doped with more than 7 atomic per cent of tin, calculated with respect to the number of indium atoms, heating the coated support in a gas containing an oxygen partial pressure of less than 10 7 atmosphere and at a temperature between 300°C and the softening temperature of the support, whereby a heat filter having a plasma wavelength of less than 1.2 μm and a free-electron density between 10 21 and 3 times 10 21 per cm 3 on the support is obtained.
Claim 6
Dependent Claim
32 words
The method as claimed in claim 3, wherein the gas contains CO, H 2 or CO and H 2 having a partial pressure of from 5 torr to 50 torr per component.
Claim 7
Dependent Claim
26 words
The method as claimed in claim 3, wherein the gas has an oxygen partial pressure between 10 - 7 atmosphere and the equilibrium pressure of indium-oxide.
Claim 8
Dependent Claim
22 words
The method as claimed in claim 5, wherein the gas contains CO and CO 2 or H 2 and H 2 O.
Claim 9
Dependent Claim
17 words
The method as claimed in claim 3 wherein the gas has a temperature between 380°C and 500°C.
Claim 10
Dependent Claim
12 words
An electric lamp provided with a filter as claimed in claim 1.
Claim 11
Dependent Claim
12 words
An electric lamp provided with a filter as claimed in claim 2.
Claim 12
Dependent Claim
17 words
The method as claimed in claim 4, wherein the gas has a temperature between 380°C and 500°C.
Claim 13
Dependent Claim
17 words
The method as claimed in claim 5, wherein the gas has a temperature between 380°C and 500°C.
References Cited (Backward Citations)
US3400288A
Cited
US3666534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |