US3821100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper ion selective sensor
Assignee: United States Department of the Interior
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Filing: 1973-02-23
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Granted: 1974-06-28
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Expires: 1993-02-23
Abstract
Abstract The activity of cupric ions in aqueous solution is determined by means of a sensor comprising a glass having the composition (R)x (As2S3)1 x, where R is CuO, CuS, Cu2S or Cu and x is from about 0.10 to about 0.25.
Inventors
- 👤 A Hilton
- 👤 I Trachtenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:14
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
The device of claim 1 in which the glass has the formula (CuO)0.15(As2S3)0.85.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |