US4305115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic shield
Assignee: Device Developments Inc
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Filing: 1979-03-14
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Granted: 1981-12-08
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Expires: 1999-03-14
Abstract
Abstract An electrostatic shield for an induction coil of a short-wave diathermy unit in the form of radial conductors arranged in a plane with a common point at their center which is grounded. The shield is positioned perpendicularly to the axis of the induction coil between the patient and coil.
Inventors
- 👤 David Armitage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:59
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
An electrostatic shield which comprises a flat disk of non-magnetic, conductor material having a solid central portion and a plurality of narrow strips connected to, radiating outwardly from, and spaced closely together about said solid portion and extending spaced apart to and at the perimeter of said shield, and means for grounding said disk attached to said central portion thereof.
Claim 2
Dependent Claim
60 words
An electrostatic shield which comprises a flat disk of non-magnetic, conductor material having a solid central portion and a plurality of narrow strips connected to, radiating outwardly from, and spaced closely together about said solid portion and extending spaced apart to and at the perimeter of said shield, and means for grounding said disk attached to said central portion thereof.
Claim 3
Dependent Claim
78 words
An electrostatic shield according to claim 1, in which said disk further comprises an annular band of a plurality of radial narrow strips interleaved between and spaced from adjacent pairs of said first named strips, each said second named strip at the inner end thereof being connected to one of said adjacent pair of first named strips and spaced outwardly from said central portion, and each said second named strip extending outwardly to the perimeter of said disk.
Claim 4
Dependent Claim
80 words
An electrostatic shield according to claim 2, which further comprises an annular band of radial narrow strips interleaved between adjacent pairs of said first and second named strips and spaced therefrom, each said third named strip being connected at the inner end thereof, outwardly of the inner ends of said second named strips alternately about said disk to one of said first and second named strips and each said third named strip extending outwardly to the perimeter of said disk.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |