Patent US3640861A successfully refreshed from Google Patents.
US3640861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making toner
Assignee: Frye Ind Inc
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Filing: 1969-11-26
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Granted: 1972-02-08
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Expires: 1989-11-26
Abstract
Abstract A process for producing solid electrostatic toner wherein pigment is milled into a molten resin while the resin contains a gas dispersed therethrough, cooling the resin to form a friable solid and comminuting said solid to toner particle size.
Inventors
- 👤 Shwang Hsia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:09
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/081; G03G9/0825
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
A process as in claim 1 wherein the amount of pigment milled into the heated resin is about 3 to about 20 percenT by weight based on the total pigment plus resin.
Claim 2
Dependent Claim
22 words
A process as in claim 1 wherein the gas is a vapor of a low-boiling point organic liquid associated with said resin.
Claim 3
Dependent Claim
14 words
A process as in claim 1 wherein said pigment is finely divided carbon black.
Claim 4
Dependent Claim
20 words
A process as in claim 2 wherein the heated resin contains molten polystyrene foam and the pigment is carbon black.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |