US3294662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ph meter
Assignee: Hoffman Electronics Corp
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Filing: 1962-05-16
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Granted: 1966-12-27
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Expires: 1982-05-16
Abstract
No abstract record available.
Inventors
- 👤 Sheldon L Matlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
78 words
APPARATUS FOR MEASURING THE PH OF BASIC LIQUIDS COMPRISING: A REFERENCE ELECTRODE; A TEST ELECTRODE MEANS FOR REACTING WITH HYDROXIDE IONS CONSISTING OF A SEMICONDUCTOR MATERIAL DOPED WITH AN ACCEPTOR IMPURITY; AND AN ELECTRICAL CIRCUIT CONNECTING SAID ELECTRODES AND HAVING A HIGH IMPEDANCE VOLTMETER, SAID CIRCUIT BEING FREE TO ANY MEANS ASSOCIATED THEREWITH OTHER THAN SAID ELECTRODES AND SAID BASIC LIQUID FOR DRIVING A CURRENT THROUGH SAID ELECTRODES, WHEREBY PH VALUES BETWEEN 12 AND 14 MAY BE MEASURED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |