US3678341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge voltage protection system
Assignee: Del Electronics Corp
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Filing: 1970-08-05
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Granted: 1972-07-18
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Expires: 1990-08-05
Abstract
Abstract Protection against surge voltages, particularly in high power applications such as electron welding systems, is provided by causing a pair of electrical conductors carrying current in opposite directions to pass through a toroid of high magnetic permeability, that toroid producing a high inductance in those lines without saturating, that inductance acting in conjunction with protective capacitors connected across the lines so as to minimize the surge voltages produced by short circuits or other abnormalities in the overall system.
Inventors
- 👤 James M Constable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:16
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/001; H02H9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
An electron beam welding machine comprising a welding gun comprising an electrode, a DC power supply therefor, a cable connecting said power supply and said filament and comprising a pair of leads through which current flows in opposite directions, and a toroid of high magnetic permeability operatively surrounding said leads in said cable, in which said cable comprises said lines enclosed within a sheath, said toroid being located between said sheath and said lines.
Claim 2
Dependent Claim
74 words
An electron beam welding machine comprising a welding gun comprising an electrode, a DC power supply therefor, a cable connecting said power supply and said filament and comprising a pair of leads through which current flows in opposite directions, and a toroid of high magnetic permeability operatively surrounding said leads in said cable, in which said cable comprises said lines enclosed within a sheath, said toroid being located between said sheath and said lines.
Claim 3
Dependent Claim
118 words
A high power DC electrical system comprising a work element, a power supply including rectifier means, a pair of electrical lines through which current flows in opposite directions connecting said power supply and said work element, a capacitor connected across said lines, and a toroid of high magnetic permeability operatively surrounding said pair of lines, in which said lines comprise a power transmission cable with said work element at one end thereof, said capacitor being connected across said lines between said power supply and said cable, said toroid being located adjacent the other end of said cable, in which said cable comprises said lines enclosed within a sheath, said toroid being located between said sheath and said lines.
Claim 4
Dependent Claim
118 words
A high power DC electrical system comprising a work element, a power supply including rectifier means, a pair of electrical lines through which current flows in opposite directions connecting said power supply and said work element, a capacitor connected across said lines, and a toroid of high magnetic permeability operatively surrounding said pair of lines, in which said lines comprise a power transmission cable with said work element at one end thereof, said capacitor being connected across said lines between said power supply and said cable, said toroid being located adjacent the other end of said cable, in which said cable comprises said lines enclosed within a sheath, said toroid being located between said sheath and said lines.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |