US3828250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic charge measuring device
Assignee: United States Department of the Army
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Filing: 1973-07-02
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Granted: 1974-08-06
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Expires: 1993-07-02
Abstract
Abstract This disclosure relates to field strength meters and particularly to meters for detecting and indicating the strength of an electrostatic field in the vicinity of an aircraft. More particularly, this invention relates to a device that uses the inverse of the Van der Graaf generator principle for charging a series of plates, successively, to the potential of a given area of the outer surface of an aircraft and carrying the charged plates within the metal shell of the aircraft to measure the charge on the plates, which is proportional to the electrostatic charge on the adjacent surface of the aircraft.
Inventors
- 👤 R Buser
- 👤 H Kaunzinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:17
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/24; G01R5/00; G01R5/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
244 words
An electrostatic charge concentration measuring device for a metallic object having an outer surface and an inner surface; comprising: a metallic enclosure attached to said inner surface of said metallic object; a rotor, positioned within said enclosure, having a surface of insulating material extending adjacent to an opening in said metallic object; a series of metallic strips having a surface area substantially equal to the opening in said metallic object mounted axially about the periphery of said insulating surface, on said rotor; means for rotating said rotor to bring said strips, successively, substantially level with said outer surface of said metallic object; a first contact means, mounted outside said metallic object, having one end positioned to engage each of said strips in turn as it becomes substantially level with said outer surface of said metallic object, the other end of said first contact means being connected to said outer surface of said metallic object; a second contact means, mounted within said enclosure, having one end positioned to engage each of said strips in turn, at a location within said enclosure after said strips have left said first contact means; an amplifying means mounted within said enclosure, having an input and an output; means connected to the other end of said second contact means and to said input of said amplifying means for discharging said strips through said input of said amplifying means; and a utilization means connected to said output of said amplifying means.
Claim 2
Dependent Claim
244 words
An electrostatic charge concentration measuring device for a metallic object having an outer surface and an inner surface; comprising: a metallic enclosure attached to said inner surface of said metallic object; a rotor, positioned within said enclosure, having a surface of insulating material extending adjacent to an opening in said metallic object; a series of metallic strips having a surface area substantially equal to the opening in said metallic object mounted axially about the periphery of said insulating surface, on said rotor; means for rotating said rotor to bring said strips, successively, substantially level with said outer surface of said metallic object; a first contact means, mounted outside said metallic object, having one end positioned to engage each of said strips in turn as it becomes substantially level with said outer surface of said metallic object, the other end of said first contact means being connected to said outer surface of said metallic object; a second contact means, mounted within said enclosure, having one end positioned to engage each of said strips in turn, at a location within said enclosure after said strips have left said first contact means; an amplifying means mounted within said enclosure, having an input and an output; means connected to the other end of said second contact means and to said input of said amplifying means for discharging said strips through said input of said amplifying means; and a utilization means connected to said output of said amplifying means.
Claim 3
Dependent Claim
66 words
An electrostatic charge concentration measuring device as in claim 1 having a third contact means, mounted within said enclosure, with one end positioned to engage each of said strips, in turn at a location within said enclosure after said strips have left said second contact means; and means for connecting the other end of said third contact means to said inner surface of said metallic object.
Claim 4
Dependent Claim
45 words
An electrostatic charge concentration measuring device as in claim 1 wherein said first contact means comprises a plurality of spring-loaded contact arms having said one ends positioned along the length of said cylindrical surface to engage corresponding portions of each of said strips in turn.
Claim 5
Dependent Claim
66 words
An electrostatic charge concentration measuring device as in claim 1 wherein said amplifying means comprises a pair of input terminals, having means for connecting one of said input terminals to said other end of said second contact means; means for connecting the other of said input terminals to the inner surface of said metallic object; and an input resistor connected across said pair of input terminals.
Claim 6
Dependent Claim
30 words
An electrostatic charge concentration measuring device as in claim 1 wherein said utilization means is a meter for indicating the electrostatic charge on said outer surface of said metallic object.
Claim 7
Dependent Claim
44 words
An electrostatic charge concentration measuring device as in claim 1, further comprising: a concentric, metallic portion of said rotor below said surface of insulating material; and means for connecting said concentric, metallic portion of said rotor to said inner surface of said metallic object.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |