US3849704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightning arrestor
Assignee: Franklin Electric Co Inc
•
Filing: 1972-10-27
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Granted: 1974-11-19
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Expires: 1992-10-27
Abstract
Abstract A lightning arrestor comprising an electrode and gas-generating, arc extinguishing material contained within a closed casing is provided for use within a submersible electric motor. The lightning arrestor is located within the motor and is grounded directly to the housing of the submerged motor.
Inventors
- 👤 A Streater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:46
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/128; H02K5/1285; H01; H01T; H01T4/00; H01T4/08; H02K11/00; H02K11/20; H02K11/26; H02K11/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
The combination of an electric motor including a grounded motor housing having an opening formed therein, power lines within said motor housing, at least one lightning arrestor mounted within said motor housing, said arrestor including a casing forming an electrode, said lightning arrestor being connected to one of said power lines and said arrestor casing being press fit into said opening to both establish electrical connection and to support said arrestor, said motor including a stator enclosure for a stator winding and potting material, said arrestor being located in said enclosure and being sealed to prevent entrance of said potting material.
Claim 2
Dependent Claim
101 words
The combination of an electric motor including a grounded motor housing having an opening formed therein, power lines within said motor housing, at least one lightning arrestor mounted within said motor housing, said arrestor including a casing forming an electrode, said lightning arrestor being connected to one of said power lines and said arrestor casing being press fit into said opening to both establish electrical connection and to support said arrestor, said motor including a stator enclosure for a stator winding and potting material, said arrestor being located in said enclosure and being sealed to prevent entrance of said potting material.
Claim 3
Dependent Claim
99 words
The combination of an electric motor including a grounded motor housing having an opening formed therein, power lines within said motor housing, at least one lightning arrestor mounted within said motor housing, said arrestor including a casing forming an electrode, said lightning arrestor being connected to one of said power lines and said arrestor casing being press fit into said opening to both establish electrical connection and to support said arrestor, said lightning arrestor further comprising a sealed casing and a gas-generating material within said casing, said sealed casing forming a chamber for containing gas generated by said material.
Claim 4
Dependent Claim
99 words
The combination of an electric motor including a grounded motor housing having an opening formed therein, power lines within said motor housing, at least one lightning arrestor mounted within said motor housing, said arrestor including a casing forming an electrode, said lightning arrestor being connected to one of said power lines and said arrestor casing being press fit into said opening to both establish electrical connection and to support said arrestor, said lightning arrestor further comprising a sealed casing and a gas-generating material within said casing, said sealed casing forming a chamber for containing gas generated by said material.
Claim 5
Dependent Claim
26 words
The combination of claim 2, wherein said chamber has a volume sufficient to contain the gas generated by a plurality of arcs caused by lightning surges.
Claim 6
Dependent Claim
17 words
The combination of claim 3, wherein said chamber is generally one-tenth of a cubic inch in volume.
Claim 7
Dependent Claim
93 words
A submersible electric motor submerged in a deep well at a depth of at least 30 feet, comprising a motor housing connected to ground by the well liquid, windings within said housing, long power lines extending from the top of the well to said windings, at least one small expulsion type lightning arrestor mounted within said housing, said arrestor being sealed to form a gas receiving chamber and including an electrode connected to one of said power lines, said arrestor further including a second electrode grounded through said housing to the well liquid.
Claim 8
Dependent Claim
93 words
A submersible electric motor submerged in a deep well at a depth of at least 30 feet, comprising a motor housing connected to ground by the well liquid, windings within said housing, long power lines extending from the top of the well to said windings, at least one small expulsion type lightning arrestor mounted within said housing, said arrestor being sealed to form a gas receiving chamber and including an electrode connected to one of said power lines, said arrestor further including a second electrode grounded through said housing to the well liquid.
Claim 9
Dependent Claim
20 words
A motor as in claim 5, wherein said second electrode is formed by a casing which encloses the first electrode.
Claim 10
Dependent Claim
30 words
A motor as in claim 5, wherein said second electrode is formed by a part of said housing, said part having a bore formed therein which receives the first electrode.
Claim 11
Dependent Claim
43 words
A motor as in claim 5, wherein said long power lines and said arrestor have sufficient resistance to limit the follow-on current to 1000 amperes or less, and said chamber has a volume on the order of one tenth of a cubic inch.
Claim 12
Dependent Claim
33 words
A motor as in claim 8, wherein said arrestor has a constant voltage drop of at least 50 volts and said long power lines have a total resistance of at least .155 ohms.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |