US3578409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensors unaffected by humidity changes to detect toxic oxidizing vapors
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1967-08-23
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Granted: 1971-05-11
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Expires: 1987-08-23
Abstract
Abstract A THIN FILM OF A METAL SUCH AS IRON, SILVER OR COPPER BEING OXIDIZABLE TO THE EXTENT OF CORROSION BONDED TO A NON-CORRODIBLE BACKING AND HAVING A THIN LAYER OF COMPOUND SUCH AS POTASSIUM CHLORIDE ON AT LEAST A PORTION OF THE METAL, THE COMPOUND BEING ADAPTED TO PREVENT THE FORMATION OF A PASSIVATING LAYER ON THE METAL WHEN EXPOSED TO OXIDIZING VAPORS AND BEING ADAPTED TO PERMIT CONTINUED OXIDATION OF THE METAL; AND AN ADDITIVE TO SAID COMPOUND OF A HYGROSCOPIC ORGANIC COMPOSITION SUCH AS GLYCEROL HAVING BEEN MIXED WITH THE COMPOUND IN SOLUTION BEFORE COATING THE METAL THEREWITH.
Inventors
- 👤 Herbert P Silverman
- 👤 Gino A Giarrusso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:25
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |