US3826747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for electrophotography
Assignee: Canon Inc
•
Filing: 1973-05-09
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Granted: 1974-07-30
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Expires: 1993-05-09
Abstract
Abstract A POSITIVE CHARGEABLE TONER FOR ELECTROPHOTOGRAPHY IS PRPARED BY DISPERSING A COLORING AGENT AND A CHELATE COMPOUND OF ETHYLENE DIAMINE TETRAACETIC ACID AND A METAL OF BI-, TRI OR TETRAVALENCE, INTO A BINDING RESIN.
Inventors
- 👤 S Tomari
- 👤 Y Sakamoto
- 👤 H Yamakami
- 👤 S Nagashima
- 👤 K Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:06
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09783; G03G9/09733; G03G9/09775
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |