US4400412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermochromic vanadium oxide coated glass
Assignee: PPG Industries Inc
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Filing: 1982-02-01
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Granted: 1983-08-23
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Expires: 2002-02-01
Abstract
Abstract A method is disclosed for producing a thermochromic window comprising a glass substrate and a coating containing VO 2 by chemical vapor deposition employing vanadium n-propylate in an oxidizing atmosphere.
Inventors
- 👤 J. Kevin Scanlon
- 👤 Charles B. Greenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:25
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/218; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/152
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A method for making a thermochromic window comprising the steps of: a. heating a glass substrate to a sufficient temperature to convert vanadium n-propylate to vanadium oxide; b. vaporizing vanadium n-propylate; c. conveying the vaporized vanadium n-propylate to said substrate in an atmosphere sufficiently oxidizing to form a thermochromic film comprising VO 2 but insufficiently oxidizing to form a film which is not thermochromic as a result of the proportion of V 2 O 5 ; d. contacting a surface of said heated glass substrate with said vapor of vanadium n-propylate in said oxidizing atmosphere to deposit thereupon a film containing VO 2 .
Claim 2
Independent Claim
104 words
A method for making a thermochromic window comprising the steps of: a. heating a glass substrate to a sufficient temperature to convert vanadium n-propylate to vanadium oxide; b. vaporizing vanadium n-propylate; c. conveying the vaporized vanadium n-propylate to said substrate in an atmosphere sufficiently oxidizing to form a thermochromic film comprising VO 2 but insufficiently oxidizing to form a film which is not thermochromic as a result of the proportion of V 2 O 5 ; d. contacting a surface of said heated glass substrate with said vapor of vanadium n-propylate in said oxidizing atmosphere to deposit thereupon a film containing VO 2 .
Claim 3
Dependent Claim
31 words
The method according to claim 1, wherein the glass substrate is heated to a temperature of at least 400° C. and said atmosphere comprises a mixture of inert gas and oxygen.
Claim 4
Dependent Claim
30 words
The method according to claim 2, wherein the glass substrate is heated to a temperature of at least 500° C. and said atmosphere comprises a mixture of nitrogen and oxygen.
Claim 5
Dependent Claim
21 words
The method according to claim 3, wherein said atmosphere comprises 90 percent by volume nitrogen and 10 percent by volume oxygen.
Claim 6
Dependent Claim
23 words
The method according to claim 1, wherein the film containing VO 2 is deposited to a thickness of about 100 to 1,500 Angstroms.
References Cited (Backward Citations)
US3483110A
Cited
US4307942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |