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US3859573A
Expired / Lapsed
US
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Simultaneous multi-core demagnetization
Assignee: Western Atlas International Inc
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Filing: 1973-10-01
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Granted: 1975-01-07
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Expires: 1993-10-01
Abstract
Abstract This invention relates to demagnetizing the cores of a plurality of input transformers, each transformer having a primary winding and a secondary winding connected to a load subject to becoming non-linear. The load has a linear operating mode when the amplitude of a sinusoidal signal applied to the primary winding is below a critical value and a non-linear operating mode when the amplitude of the applied AC signal exceeds this critical value. The demagnetization is achieved by ''''wiping'''' each transformer core with a decaying AC signal having an initial amplitude up to the critical value and a frequency corresponding to the initial amplitude which is sufficient to saturate each core.
Inventors
- 👤 Lee E Siems
- 👤 Ben B Thigpen
- 👤 Charles C Harman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:41
CPC Classifications
H; H01; H01F; H01F13/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
In a method for demagnetizing the cores of a plurality of input transformers, each transformer having a core, a primary winding and secondary winding connected to a load, the load having a linear operating mode when the amplitude of an AC signal applied to the primary winding of the load''s input transformer is below a critical value, and the load having a non-linear operating mode when the amplitude of the applied AC signal exceeds said critical value, the improvement comprising: wiping each core with a decaying AC signal having an initial amplitude up to said critical value and a frequency corresponding to said critical value, the value of said frequency being selected to saturate each core.
Claim 2
Dependent Claim
116 words
In a method for demagnetizing the cores of a plurality of input transformers, each transformer having a core, a primary winding and secondary winding connected to a load, the load having a linear operating mode when the amplitude of an AC signal applied to the primary winding of the load''s input transformer is below a critical value, and the load having a non-linear operating mode when the amplitude of the applied AC signal exceeds said critical value, the improvement comprising: wiping each core with a decaying AC signal having an initial amplitude up to said critical value and a frequency corresponding to said critical value, the value of said frequency being selected to saturate each core.
Claim 3
Dependent Claim
16 words
The method of claim 2 wherein the cores of said plurality of transformers are wiped simultaneously.
Claim 4
Dependent Claim
11 words
The method of claim 3 wherein said load is a preamplifier.
Claim 5
Independent Claim
109 words
A method for demagnetizing an input transformer having a core, a primary winding and a secondary winding connected to a load, the load having a linear operating mode when the amplitude of an AC signal applied to the primary winding of the load''s input transformer is below a critical value, and the load having a non-linear operating mode when the amplitude of the applied AC signal exceeds said critical value, the improvement comprising: wiping said core with a decaying AC signal having an initial amplitude up to said critical value and a frequency corresponding to said critical value, the value of said frequency being selected to saturate each core.
Claim 6
Independent Claim
109 words
A method for demagnetizing an input transformer having a core, a primary winding and a secondary winding connected to a load, the load having a linear operating mode when the amplitude of an AC signal applied to the primary winding of the load''s input transformer is below a critical value, and the load having a non-linear operating mode when the amplitude of the applied AC signal exceeds said critical value, the improvement comprising: wiping said core with a decaying AC signal having an initial amplitude up to said critical value and a frequency corresponding to said critical value, the value of said frequency being selected to saturate each core.
References Cited (Backward Citations)
US2959722A
Cited
US3482163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |