US3220833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic printing method
Assignee: Sun Chemical Corp
•
Filing: 1962-08-06
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Granted: 1965-11-30
•
Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Mcfarlane Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G03G15/346; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF ELECTROSTATIC PRINTING COMPRISING THE STEPS OF: PROJECTING LIGHT IMAGES ONTO A CONTINUOUSLY MOVING ELECTROSTATICALLY CHARGED GRID TO PRODUCE A LATENT ELECTROSTATIC CHARGE IMAGE; DIRECTLY POWDERING THE IAGE WITH FINE, GRANULAR MARKING MATERIAL THROUGH THE GRID; AND, INTRODUCING THE SO-POWDERED IMAGE INTO AN ELECTROSTATIC FIELD ESTABLISHED IN THE AIR TO PROJECT THE MARKING MATERIAL ALONG THE LINES OF ELECTROSTATIC FORCE ONTO A TRANSFER MEDIUM TO BE PRINTED.
Claim 2
Independent Claim
69 words
THE METHOD OF ELECTROSTATIC PRINTING COMPRISING THE STEPS OF: PROJECTING LIGHT IMAGES ONTO A CONTINUOUSLY MOVING ELECTROSTATICALLY CHARGED GRID TO PRODUCE A LATENT ELECTROSTATIC CHARGE IMAGE; DIRECTLY POWDERING THE IAGE WITH FINE, GRANULAR MARKING MATERIAL THROUGH THE GRID; AND, INTRODUCING THE SO-POWDERED IMAGE INTO AN ELECTROSTATIC FIELD ESTABLISHED IN THE AIR TO PROJECT THE MARKING MATERIAL ALONG THE LINES OF ELECTROSTATIC FORCE ONTO A TRANSFER MEDIUM TO BE PRINTED.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |