US2901374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development of electrostatic image and apparatus therefor
Assignee: Battelle Development Corp
•
Filing: 1955-05-04
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Granted: 1959-08-25
•
Expires: 1975-05-04
Abstract
No abstract record available.
Inventors
- 👤 Robert W Gundlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE COMPRISING AREAS OF VARYING CHARGE ON AN INSULATING SURFACE, SAID PROCESS COMPRISING FORMING A DEPOSIT OF FINELY-DIVIDED ELECTROSTATICALLY CHARGED POWDER MATERIAL ON ONE SURFACE OF AN INSULATING SHEET, BRINGING A PRINTING SHEET UNTO CONTACT WITH THE POWDER-BEARING SIDE OF SAID INSULATING SHEET TO THEREBY FORM A SANDWICH, CONTACTING ONE SIDE OF SAID SANDWICH WITH AN INSULATING SURFACE BEAR-
Claim 2
Independent Claim
66 words
A METHOD OF DEVELOPING AN ELECTROSTATIC LATENT IMAGE COMPRISING AREAS OF VARYING CHARGE ON AN INSULATING SURFACE, SAID PROCESS COMPRISING FORMING A DEPOSIT OF FINELY-DIVIDED ELECTROSTATICALLY CHARGED POWDER MATERIAL ON ONE SURFACE OF AN INSULATING SHEET, BRINGING A PRINTING SHEET UNTO CONTACT WITH THE POWDER-BEARING SIDE OF SAID INSULATING SHEET TO THEREBY FORM A SANDWICH, CONTACTING ONE SIDE OF SAID SANDWICH WITH AN INSULATING SURFACE BEAR-
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |