US3843539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic solution for level devices
Assignee: Boeing North American Inc
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Filing: 1972-06-26
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Granted: 1974-10-22
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Expires: 1992-06-26
Abstract
Abstract 1. AN ELECTROLYTIC SOLUTION FOR A LEVEL INDICATING DEVICE, CONSISTING ESSENTIALLY OF: A FLUID CONSISTING OF APPROXIMATEY 40-60 PARTS BY VOLUME OF ETHYL ALCOHOL AND THE REST METHYL ALCOHOL; AND AMMONIUM CARBONATE OF SUFFICIENT CONCENTRATION OF ADJUST THE RESISTIVITY OF SAID FLUID TO APPROXIMATELY 702500 OHM-CM. AT 24*C.
Inventors
- 👤 R Willing
- 👤 G Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:54
CPC Classifications
G; G01; G01C; G01C9/00; G01C9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
AN ELECTROLYTIC SOLUTION FOR A LEVEL INDICATING DEVICE, CONSISTING ESSENTIALLY OF: A FLUID CONSISTING OF APPROXIMATEY 40-60 PARTS BY VOLUME OF ETHYL ALCOHOL AND THE REST METHYL ALCOHOL; AND AMMONIUM CARBONATE OF SUFFICIENT CONCENTRATION OF ADJUST THE RESISTIVITY OF SAID FLUID TO APPROXIMATELY 702500 OHM-CM. AT 24*C.
Claim 2
Dependent Claim
47 words
AN ELECTROLYTIC SOLUTION FOR A LEVEL INDICATING DEVICE, CONSISTING ESSENTIALLY OF: A FLUID CONSISTING OF APPROXIMATEY 40-60 PARTS BY VOLUME OF ETHYL ALCOHOL AND THE REST METHYL ALCOHOL; AND AMMONIUM CARBONATE OF SUFFICIENT CONCENTRATION OF ADJUST THE RESISTIVITY OF SAID FLUID TO APPROXIMATELY 702500 OHM-CM. AT 24*C.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |