US3920533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light filter and process for producing the same
Assignee: Radiotechnique Compelec RTC SA
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Filing: 1974-04-10
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Granted: 1975-11-18
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Expires: 1994-04-10
Abstract
Abstract A light filter is disclosed which is adapted for transmitting luminous energy while reflecting thermal energy. The filter comprises a substrate body having a thin light filtering layer of metal deposited on one surface of the substrate body and a protective film of indium oxide coated on the filtering layer. An improved cathodic spraying process is disclosed for fabricating the light filter, wherein the layers are successively applied by advancing the substrate between first and second target electrodes consisting respectively of gold-based bismuth alloy and indium. The process may be conducted in dry air under reduced pressure.
Inventors
- 👤 Jean Pompei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3605; C03C17/3613; C03C17/3618; C03C17/3649; C03C17/3657; C03C17/366; C03C17/3681; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/086; C23C14/14; C23C14/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A CATHODIC SPRAYING PROCESS FOR THE PRODUCTION OF A BODY WHICH IS RELATIVELY TRANSMISSIVE TO RADIANT ENERGY INCIDENT THEREON OVER AT LEAST A PORTION OF THE LUMINOUS PART OF THE ELECTROMAGNETIC SPECTRUM AND WHICH IS RELATIVELY NON-TRANSMISSIVE TO RADIANT ENERGY INCIDENT THEREON OVER AT LEAST A PORTION OF THE NON-LUMINOUS PART OF THE ELECTROMAGNETIC SPECTRUM COMPRISING THE STEPS OF: POSITIONING A TRANSPARENT SUBSTRATE BODY ON A COLLECTING ELECTRODE IN AN ENCLOSED VOLUME; SUCCESSIVELY ADVANCING THE COLLECTING ELECTRODE BETWEEN FIRST AND SECOND TARGET ELECTRODES, WHEREIN SAID FIRST TARGET ELECTRODE IS FORMED OF AN ALLOY CONSISTING OF ABOUT BETWEEN 90 AND 98 PERCENT GOLD AND ABOUT 2 TO 10 PERCENT BISMUTH BY WEIGHT AND SAID SECOND TARGET ELECTRODE AND SISTS ESSENTIALLY OF INDIUM, THE COLLECTING ELECTRODE AND THE TARGET ELECTRODES ARE SEPARATED BY A DISTANCE IN THE RANGE OF ABOUT 50 TO 70 MM, A POTENTIAL DIFFERENCE IN THE RANGE OF ABOUT 500 TO 70 MM, A POTENTIAL DIFFERENCE IN THE RANGE OF ABOUT 2,000 TO 4,000 VOLTS DC IS APPLIED BETWEEN TARGET AND COLLECTOR ELECTRODES, AND A PRESSURE IN THE RANGE OF 1 X 10**-2 TO 1 X 10**-3 TORR IS ESTABLISHED IN THE ENCLOSED VOLUME IN WHICH SAID CATHODIC SPRAYING OCCURS.
Claim 2
Dependent Claim
201 words
A CATHODIC SPRAYING PROCESS FOR THE PRODUCTION OF A BODY WHICH IS RELATIVELY TRANSMISSIVE TO RADIANT ENERGY INCIDENT THEREON OVER AT LEAST A PORTION OF THE LUMINOUS PART OF THE ELECTROMAGNETIC SPECTRUM AND WHICH IS RELATIVELY NON-TRANSMISSIVE TO RADIANT ENERGY INCIDENT THEREON OVER AT LEAST A PORTION OF THE NON-LUMINOUS PART OF THE ELECTROMAGNETIC SPECTRUM COMPRISING THE STEPS OF: POSITIONING A TRANSPARENT SUBSTRATE BODY ON A COLLECTING ELECTRODE IN AN ENCLOSED VOLUME; SUCCESSIVELY ADVANCING THE COLLECTING ELECTRODE BETWEEN FIRST AND SECOND TARGET ELECTRODES, WHEREIN SAID FIRST TARGET ELECTRODE IS FORMED OF AN ALLOY CONSISTING OF ABOUT BETWEEN 90 AND 98 PERCENT GOLD AND ABOUT 2 TO 10 PERCENT BISMUTH BY WEIGHT AND SAID SECOND TARGET ELECTRODE AND SISTS ESSENTIALLY OF INDIUM, THE COLLECTING ELECTRODE AND THE TARGET ELECTRODES ARE SEPARATED BY A DISTANCE IN THE RANGE OF ABOUT 50 TO 70 MM, A POTENTIAL DIFFERENCE IN THE RANGE OF ABOUT 500 TO 70 MM, A POTENTIAL DIFFERENCE IN THE RANGE OF ABOUT 2,000 TO 4,000 VOLTS DC IS APPLIED BETWEEN TARGET AND COLLECTOR ELECTRODES, AND A PRESSURE IN THE RANGE OF 1 X 10**-2 TO 1 X 10**-3 TORR IS ESTABLISHED IN THE ENCLOSED VOLUME IN WHICH SAID CATHODIC SPRAYING OCCURS.
Claim 3
Dependent Claim
45 words
The process of claim 1 wherein said electrodes are preferably separated by a distance of about 60 mm, a potential preferably of about 3,000 volts DC is applied between said target and collector electrodes and a pressure of 5 X 10 3 torr is established.
Claim 4
Dependent Claim
60 words
The process of claim 1 wherein the collecting electrode supporting the substrate body transports the substrate body successively and regularly before each of the target electrodes positioned one after the other, and wherein a discharge is maintained both on the gold-bismuth and indium targets whereby deposits of gold and of indium oxide are successively produced without interruption in the discharge.
Claim 5
Dependent Claim
29 words
A process according to claim 3 wherein said target electrodes are spaced apart by a distance at least equal to the distance separating said targets from the collecting electrode.
Claim 6
Dependent Claim
38 words
A process according to claim 1 wherein the indium of said target electrode is alloyed with tin in the proportion by weight of about 79.5 to 80.5 percent of indium and about 19.5 to 20.5 percent of tin.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the discharge atmosphere consists essentially of dry air.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |