US4028260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid for a feeler element for the electrical measurement of inclinations
Assignee: Rheinmetall Air Defence AG
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Filing: 1975-12-15
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Granted: 1977-06-07
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Expires: 1995-12-15
Abstract
Abstract A liquid for a level or a feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current or impedance between surface electrodes, which current or impedance changes as a function of tilting, the electrodes being in contact with the liquid which is contained in a container and each electrode is connected with an electrode terminal which can be contacted from the outside. The liquid contains a major proportion, i.e. at least about 50 percent by weight of hydrazine monohydrate and an effective amount of at least one compatible conducting salt dissolved in said liquid.
Inventors
- 👤 Harry Zuest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
G; G01; G01C; G01C25/00; G01C9/00; G01C9/02; G01C9/06; G01C9/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least about 50 percent by weight of hydrazine monohydrate and an effective amount of at least one conducting salt dissolved therein for increasing the electrical conductivity of said hydrazine monohydrate, said salt being chemically inert with said hydrazine monohydrate.
Claim 2
Dependent Claim
74 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least about 50 percent by weight of hydrazine monohydrate and an effective amount of at least one conducting salt dissolved therein for increasing the electrical conductivity of said hydrazine monohydrate, said salt being chemically inert with said hydrazine monohydrate.
Claim 3
Dependent Claim
20 words
The liquid of claim 1, further containing a non-aqueous organic liquid diluent chemically inert and miscible with said hydrazine monohyrate.
Claim 4
Dependent Claim
18 words
The liquid of claim 2, further containing a wetting agent chemically inert and miscible with said hydrazine monohydrate.
Claim 5
Dependent Claim
83 words
The liquid of claim 1, consisting of from about 50 percent by weight to about 80 percent by weight of said hydrazine monohydrate, said effective amount of at least one conducting salt dissolved therein, a non-ionic wetting agent in an amount of from about 0.01 percent by weight to about 1 percent by weight, said non-ionic wetting agent being chemically inert and miscible with said hydrazine monohydrate, and a non-aqueous liquid organic diluent chemically inert and miscible with said hydrazine monohydrate as balance.
Claim 6
Dependent Claim
40 words
The liquid of claim 4, consisting of about 80 percent by weight of said hydrazine monohydrate, about 1 percent by weight of said conducting salt, about 0.04 percent by weight of said non-ionic wetting agent, and said diluent as balance.
Claim 7
Dependent Claim
25 words
The liquid of claim 3, wherein said wetting agent is selected from the group consisting of alkyl polyglycol ethers, amine oxides and perfluoroalkyl sulfonic compounds.
Claim 8
Dependent Claim
76 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate and at least 0.1 percent by weight of conducting salt soluble in hydrazine monohydrate and dissolved therein, the respective percentages of hydrazine monohydrate and of conducting salt balancing each other to 100 percent.
Claim 9
Dependent Claim
76 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate and at least 0.1 percent by weight of conducting salt soluble in hydrazine monohydrate and dissolved therein, the respective percentages of hydrazine monohydrate and of conducting salt balancing each other to 100 percent.
Claim 10
Dependent Claim
92 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate, a non-aqueous organic liquid diluent miscible and chemically inert with respect thereto and mixed therewith to form a mixture, and at least 0.1 percent by weight of conducting salt soluble in the mixture and dissolved therein, the percentage by weight of said non-aqueous organic liquid diluent constituting the balance
Claim 11
Dependent Claim
92 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate, a non-aqueous organic liquid diluent miscible and chemically inert with respect thereto and mixed therewith to form a mixture, and at least 0.1 percent by weight of conducting salt soluble in the mixture and dissolved therein, the percentage by weight of said non-aqueous organic liquid diluent constituting the balance
Claim 12
Dependent Claim
140 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate, a non-aqueous organic liquid diluent miscible and chemically inert with respect thereto and mixed therewith to form a mixture, at least 0.1 percent by weight of conducting salt soluble in the mixture and dissolved therein, and up to 1 percent by weight of a non-ionic wetting agent chemically inert and miscible therewith, said non-ionic wetting agent being selected from the group consisting of alkyl polyglycol ethers, amine oxides and perfluoroalkyl sulfonic compounds, the percentage by weight of said nonaqueous organic liquid diluent constituting the balance to 100 percent with respect to the sum of the other percentages.
Claim 13
Dependent Claim
140 words
A liquid for a level or feeler element for the electrical measurement of inclinations and for the determination of the vertical by measuring an electrical current between surface electrodes, said liquid consisting essentially of at least 50 percent by weight of hydrazine monohydrate, a non-aqueous organic liquid diluent miscible and chemically inert with respect thereto and mixed therewith to form a mixture, at least 0.1 percent by weight of conducting salt soluble in the mixture and dissolved therein, and up to 1 percent by weight of a non-ionic wetting agent chemically inert and miscible therewith, said non-ionic wetting agent being selected from the group consisting of alkyl polyglycol ethers, amine oxides and perfluoroalkyl sulfonic compounds, the percentage by weight of said nonaqueous organic liquid diluent constituting the balance to 100 percent with respect to the sum of the other percentages.
Claim 14
Dependent Claim
49 words
The liquid of claim 9, consisting essentially of 50 to 80 percent by weight of hydrazine monohydrate, at least 0.1 percent by weight of said conducting salt, 0.01 to 1 percent by weight of said wetting agent and said non-aqueous organic liquid diluent constituting the balance to 100 percent.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |