Edge and latitude developer
Abstract
Abstract A DEVELOPER FOR DEVELOPING ELECTROSTATIC IMAGES ON SURFACES. THE DEVELOPER CONTAINS AT LEAST TWO TYPES OF PARTICLES, ONE OF WHICH IS AN INSULATOR AND IS PREFERABLY OF FINER SIZE AND THE OTHER OF WHICH IS A MORE CONDUCTIVE PARTICULATE DEVELOPER AND PREFERABLY OF COARSER SIZE WITH POSSIBLY A FURTHER PARTICULATE MATERIAL WHICH HAS ONE END INSULATING AND THE OTHER RELATIVELY MORE CONDUCTIVE OR POLAR WHEREBY THE MORE CONDUCTIVE PARTICLES TEND TO DEVELOP THE EDGES OF THE IMAGE AND THE INSULATING PARTICLES THE INTERMEDIATE PORTIONS BETWEEN THE EDGES BUT WHEREIN THE INSULATOR PARTICLES ENABLE THE RELATIVELY MORE CONDUCTIVE PARTICLES TO BE RETAINED ON A SURFACE BY A LIMITING CHARGE TRANSFER OF THE RELATIVELY MORE CONDUCTIVE PARTICLES TO THE SURFACE CONTAINING THE THE ELECTROSTATIC IMAGE, AND THE THIRD TYPE OF PARTICLE CAN ROTATE AS A STIRRER.
Inventors
- 👤 K Metcalfe
- 👤 I Smith
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |