Patent US4055798A successfully refreshed from Google Patents.
US4055798A
Expired / Lapsed
US
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Rotary electric field intensity measuring device
Assignee: Individual
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Filing: 1976-02-27
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Granted: 1977-10-25
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Expires: 1996-02-27
Abstract
Abstract A rotary electric field intensity measuring device comprising a grounded housing, an amplifier mounted within said housing and electrically connected to an external recording device, an electric motor mounted within said housing and having an output shaft, said motor being adapted to be connected to an external power source, a rotary grounded shielding conical electrode means having a rotary shaft connected to said output shaft of the motor for rotation therewith and alternating voltage inducing means and a shielded stationary conical electrode means secured to said housing within said shielding rotary electrode means in spaced relationship to the latter and having alternating voltage inducing means in cooperation with said alternating voltage inducing means of the rotary electrode means.
Inventors
- 👤 Giichiro Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A rotary electric field intensity measuring device comprising a housing, stationary frusto-conical electrode means secured to said housing and having alternating voltage inducing means, an induced charge take-out line connected to said stationary electrode means, shielding frusto-conical rotary electrode means spaced above said stationary electrode means and having alternating voltage inducing means in cooperation with said stationary electrode means, and means to rotate said rotary electrode means.
Claim 2
Dependent Claim
67 words
A rotary electric field intensity measuring device comprising a housing, stationary frusto-conical electrode means secured to said housing and having alternating voltage inducing means, an induced charge take-out line connected to said stationary electrode means, shielding frusto-conical rotary electrode means spaced above said stationary electrode means and having alternating voltage inducing means in cooperation with said stationary electrode means, and means to rotate said rotary electrode means.
Claim 3
Dependent Claim
46 words
The rotary electric field intensity measuring device as set forth in claim 1, in which each of said stationary and rotary electrode means is formed of a sheet metal and has the frusto-conical shape thereof with the base of the cone vertically below the apex thereof.
Claim 4
Dependent Claim
37 words
The rotary electric field intensity measuring device as set forth in claim 2, in which said stationary electrode means is shielded by said rotary electrode means and has dimensions smaller than those of said rotary electrode means.
Claim 5
Dependent Claim
53 words
The rotary electric field intensity measuring device as set forth in claim 1, further including a hollow insulation column which is secured to said housing and to which said stationary electrode means is secured, and a metal shielding sleeve surrounding said column to define an air space therebetween and secured to said housing.
Claim 6
Dependent Claim
40 words
The rotary electric field intensity measuring device as set forth in claim 1, in which said alternating voltage inducing means of each electrode means comprises a plurality of circumferentially spaced and longitudinally extending openings formed in the associated electrode means.
Claim 7
Dependent Claim
22 words
The rotary electric field intensity measuring device as set forth in claim 1, including anti short-circuit means in said stationary electrode means.
Claim 8
Dependent Claim
30 words
The rotary electric field intensity measuring device as set forth in claim 6, wherein said anti short-circuit means comprises a plurality of spaced openings formed in said stationary electrode means.
Claim 9
Dependent Claim
48 words
The rotary electric field intensity measuring device as set forth in claim 5, including anti short-circuit means in said stationary electrode means, said anti short-circuit means comprising a plurality of vertically spaced transverse openings formed in said stationary electrode means between adjacent ones of said longitudinally extending openings.
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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |