Patent US3822198A successfully refreshed from Google Patents.
US3822198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Break resistant membrane
Assignee: Schott AG
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Filing: 1971-08-06
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Granted: 1974-07-02
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Expires: 1991-08-06
Abstract
Abstract MEMBRANES FOR USE IN ELECTRODES FOR THE MEASUREMENT OF ION CONCENTRATIONS WHEREIN THE MEMBRANES HAVE AT LEAST TWO LAYERS OF DIFFERENT MATERIALS, SUCH AS A MEMBRANE HAVING A LAYER OF IMPERVIOUS POLYCRYSTALLINE AGCL ATTACHED TO A LAYER OF IMPERVIOUS POLYCRYSTALLINE AGBR.
Inventors
- 👤 F Bauke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/36; G01N27/333
Claims Analysis
Total Claims: 0
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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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |