US3774573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder cloud generator and method
Assignee: Diagnostic Instruments Inc
•
Filing: 1971-06-30
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Granted: 1973-11-27
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Expires: 1991-06-30
Abstract
Abstract A powder cloud generator utilized for the development of electrostatic latent images on a receptor and having a chamber with an opening therein to receive the receptor. A selected amount of developer powder is delivered to a specific location within the chamber followed by directing a stream of gas against the powder whereby the powder particles are dispersed and a powder cloud is thereby formed in the chamber. Additionally, means may be provided for electrostatically charging the powder particles with a charge of a desired polarity.
Inventors
- 👤 S Hindell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:06
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0803; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
Powder cloud apparatus comprising: an enclosed chamber having an opening therein in which an image receptor can be disposed; means for delivering a selected amount of a developer powder within said chamber; a generally horizontal platform disposed in said chamber for receiving said powder and allowing the powder to rest thereon; an electrically-grounded screen disposed adjacent said plAtform to diffuse the powder as it is blown therefrom by gas from inlet means; a corona discharge electrode disposed adjacently above said platform whereby a corona discharge can be generated between said screen and said electrode; and gas inlet means connected to said chamber for introducing a gas burst thereto, this inlet means being positioned to deliver the gas so as to propel the powder from its receiving means and disperse and distribute it as a cloud across the chamber.
Claim 2
Dependent Claim
138 words
Powder cloud apparatus comprising: an enclosed chamber having an opening therein in which an image receptor can be disposed; means for delivering a selected amount of a developer powder within said chamber; a generally horizontal platform disposed in said chamber for receiving said powder and allowing the powder to rest thereon; an electrically-grounded screen disposed adjacent said plAtform to diffuse the powder as it is blown therefrom by gas from inlet means; a corona discharge electrode disposed adjacently above said platform whereby a corona discharge can be generated between said screen and said electrode; and gas inlet means connected to said chamber for introducing a gas burst thereto, this inlet means being positioned to deliver the gas so as to propel the powder from its receiving means and disperse and distribute it as a cloud across the chamber.
Claim 3
Dependent Claim
23 words
Powder cloud apparatus of claim 1 wherein said means for admitting the powder includes a tube, said electrode being mounted within said tube.
References Cited (Backward Citations)
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |