Patent US3607342A successfully refreshed from Google Patents.
US3607342A
Expired / Lapsed
US
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Method of development of electrostatic images
Assignee: Fujifilm Holdings Corp
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Filing: 1967-11-29
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Granted: 1971-09-21
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Expires: 1987-11-29
Abstract
Abstract A method of developing an electrostatic image which comprises feeding a toner, its carrier and a material having 1) a smaller apparent density than said carrier, 2) at least the same size as said carrier, and 3) an electrically conductive surface, to a surface having an electrostatic latent image, and effecting relative motion between said surface having said latent electrostatic image and the mixture of the toner, the carrier and the material.
Inventors
- 👤 Masamichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:11
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G13/00; G03G13/06; G03G13/08; G03G9/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A method of developing an electrostatic image which comprises (a) feeding a toner, a carrier therefore and a particulate material (1) having an electrically conductive surface, (2) having a smaller apparent density than said carrier, (3) having an average particle size of at least about 2 times that of said carrier to a surface having an electrostatic latent image, and (4) being composed of a nonconductive material covered with a conductive material, and (b) effecting relative motion between said surface having said electrostatic image and the mixture of the toner, the carrier and the material whereby (1) the weight of said particulate material is heavy enough to facilitate good electrical contact between said particulate materials and light enough to prevent said toner from being too strongly pressed against said surface having said electrostatic latent image and (2) most of the particulate material will rise to the top of said mixture while most of the carrier will settle at the bottom thereof when said mixture undergoes said relative motion with said surface having said electrostatic latent image.
Claim 2
Independent Claim
173 words
A method of developing an electrostatic image which comprises (a) feeding a toner, a carrier therefore and a particulate material (1) having an electrically conductive surface, (2) having a smaller apparent density than said carrier, (3) having an average particle size of at least about 2 times that of said carrier to a surface having an electrostatic latent image, and (4) being aluminum in the form of a tube, and (b) effecting relative motion between said surface having said electrostatic image and the mixture of the toner, the carrier and the material whereby (1) the weight of said particulate material is heavy enough to facilitate good electrical contact between said particulate materials and light enough to prevent said toner from being too strongly pressed against said surface having said electrostatic latent image and (2) most of the particulate material will rise to the top of said mixture while most of the carrier will settle at the bottom thereof when said mixture undergoes said relative motion with said surface having said electrostatic latent image.
Claim 3
Dependent Claim
21 words
The method in accordance with claim 2 wherein the conductive material is selected from the group consisting of silver and copper.
Claim 4
Dependent Claim
13 words
The method in accordance with claim 2 wherein the nonconductive material is hollow.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |