Patent US3577208A successfully refreshed from Google Patents.
US3577208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic grounding probe for use in explosive atmospheres
Assignee: Individual
•
Filing: 1969-07-03
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Granted: 1971-05-04
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Expires: 1989-07-03
Abstract
Abstract A grounding probe having a stationary contact connected to ground through a high resistance. A movable contact is normally biased away from the stationary contact but can be moved adjacent the stationary contact by pressing it against the object to be grounded. The area where stationary and movable contacts come together is enclosed so that any spark is isolated from the atmosphere.
Inventors
- 👤 John T Petrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:21
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/04; G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06788; H01; H01R; H01R11/00; H01R11/11; H01R11/18; H01R4/00; H01R4/58; H01R4/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
The grounding device of claim 1 wherein said biasing means comprises a spring.
Claim 2
Dependent Claim
13 words
The grounding device of claim 2 wherein said sealing means comprises an O-ring.
Claim 3
Dependent Claim
21 words
The grounding device of claim 1 wherein said biasing means comprises a diaphragm attached to the front end of said housing.
Claim 4
Dependent Claim
21 words
The grounding device of claim 4 wherein said biasing means comprises a bellows attached to the front end of said housing.
Claim 5
Dependent Claim
16 words
The grounding device of claim 1 wherein said spark chamber contains an insulating vapor under pressure.
References Cited (Backward Citations)
US2020402A
Cited
US2753491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |