US2877133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic photography
Assignee: General Dynamics Corp
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Filing: 1956-10-22
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Granted: 1959-03-10
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Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Edward F Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:13
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR DEVELOPING A VISIBLE IMAGE OF A LATENT ELECTROSTATIC CHARGE IMAGE IN A HIGH RESISTANCE MATERIAL WHICH COMPRISES: APPLYING A LIQUID DEVELOPER CONSISTING ESSENTIALLY OF A FINELY DIVIDED OPAQUE SOLID ELECTROSTATICALLY ATTRACTABLE POWDER OF WHICH THE PARTICLE SIZE IS NOT GREATER THAN 10 MICRONS DISPERESED IN A LIQUID HAVING A SPECIFIC RESISTIVITY OF AT LEAST ABOUT 109 OHM CENTIMETERS AND CONTAINING UP TO ABOUT 20% BY WEIGHT OF A SILICA AEROGEL SUSPENDED THEREIN, TO THE MATERIAL BEARING THE ELECTROSTATIC CHARGE IMAGE FOR A TIME SUFFICIENT TO DEVELOP THE DESIRE VISIBLE IMAGE.
Claim 2
Dependent Claim
93 words
A PROCESS FOR DEVELOPING A VISIBLE IMAGE OF A LATENT ELECTROSTATIC CHARGE IMAGE IN A HIGH RESISTANCE MATERIAL WHICH COMPRISES: APPLYING A LIQUID DEVELOPER CONSISTING ESSENTIALLY OF A FINELY DIVIDED OPAQUE SOLID ELECTROSTATICALLY ATTRACTABLE POWDER OF WHICH THE PARTICLE SIZE IS NOT GREATER THAN 10 MICRONS DISPERESED IN A LIQUID HAVING A SPECIFIC RESISTIVITY OF AT LEAST ABOUT 109 OHM CENTIMETERS AND CONTAINING UP TO ABOUT 20% BY WEIGHT OF A SILICA AEROGEL SUSPENDED THEREIN, TO THE MATERIAL BEARING THE ELECTROSTATIC CHARGE IMAGE FOR A TIME SUFFICIENT TO DEVELOP THE DESIRE VISIBLE IMAGE.
References Cited (Backward Citations)
US2682478A
Cited
US2784109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |