Patent US4941224A successfully refreshed from Google Patents.
US4941224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic dust collector for use in vacuum system
Assignee: HAJIME ISHIMARU
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Filing: 1989-07-19
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Granted: 1990-07-17
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Expires: 2009-07-19
Abstract
Abstract An electrostatic dust collector including a wall enclosing a vacuum chamber in which a target face to be subjected to dust removal is provided, an electron beam emitting device for emitting electron beams to dust on the target face so as to charge the dust negatively, a dielectric member which is provided in the vacuum chamber and has a collecting face confronting the target face and a member for imparting positive potential to the collecting face such that the dust charged negatively is attracted to the collecting face.
Inventors
- 👤 Hiroshi Saeki
- 👤 Junji Ikeda
- 👤 Hajime Ishimaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/12; C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/564; C23C14/02; C23C14/021; C23C14/022
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
87 words
An electrostatic dust collector comprising: a wall enclosing a vacuum chamber in which a target face to be subjected to dust removal is provided; an electron beam emitting means for emitting electron beams to dust on said target face so as to charge the dust negatively; a dielectric member which is provided in the vacuum chamber and has a collecting face confronting said target face; and means for imparting positive potential to said collecting face such that the dust charged negatively is attracted to said collecting face.
Claim 2
Dependent Claim
87 words
An electrostatic dust collector comprising: a wall enclosing a vacuum chamber in which a target face to be subjected to dust removal is provided; an electron beam emitting means for emitting electron beams to dust on said target face so as to charge the dust negatively; a dielectric member which is provided in the vacuum chamber and has a collecting face confronting said target face; and means for imparting positive potential to said collecting face such that the dust charged negatively is attracted to said collecting face.
Claim 3
Dependent Claim
120 words
An electrostatic dust collector as claimed in claim 1, wherein said dielectric member is formed into a tapelike shape, said electrostatic dust collector further comprising: a cassette which accommodates said dielectric member and includes first and second hubs and an electrode for imparting positive potential to said collecting face; said dielectric member being trained over said first and second hubs so as to be fed from said first hub to said second hub; said electrode being disposed at a location confronting, in the course of a path of feed of said dielectric member from said first hub to said second hub, said target face; and a drive means for driving said second hub so as to feed said dielectric member.
References Cited (Backward Citations)
US4071334A
Cited
US4744833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |