US2899331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of developing electrostatic
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:59
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN A PROCESS FOR MAKING VISIBLE AN ELECTROSTATIC IMAGE COMPRISING AREAS OF VARYING ELECTROSTATIC CHARGE ON AN ELECTRICALLY INSULATING SURFACE BY CONTACTING SAID IMAGE, WITH AEROSOL OF POSITIVELY ELECTROSTATICALLY CHARGED FINELY-DIVIDED CHARCOAL WHEREBY SAID CHARCOAL DEPOSITS ON SAID INSULATING SURFACE IN CONFORMITY WITH SAID IMAGE, THE IMPROVEMENT COMPRISING GENERATING SAID POSITIVELY CHARGED AEROSOL BY PASSING THROUGH A BRASS ORIFICE IN TURBULENT FLOW A GAS STREAM CONTAINING FINELY-DI-
Claim 2
Dependent Claim
67 words
IN A PROCESS FOR MAKING VISIBLE AN ELECTROSTATIC IMAGE COMPRISING AREAS OF VARYING ELECTROSTATIC CHARGE ON AN ELECTRICALLY INSULATING SURFACE BY CONTACTING SAID IMAGE, WITH AEROSOL OF POSITIVELY ELECTROSTATICALLY CHARGED FINELY-DIVIDED CHARCOAL WHEREBY SAID CHARCOAL DEPOSITS ON SAID INSULATING SURFACE IN CONFORMITY WITH SAID IMAGE, THE IMPROVEMENT COMPRISING GENERATING SAID POSITIVELY CHARGED AEROSOL BY PASSING THROUGH A BRASS ORIFICE IN TURBULENT FLOW A GAS STREAM CONTAINING FINELY-DI-
References Cited (Backward Citations)
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Cited
US1945907A
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US1957314A
Cited
US2297691A
Cited
US2357809A
Cited
US2784109A
Cited
US2725304A
Cited
US2707674A
Cited
US2711481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |