Patent US4758489A successfully refreshed from Google Patents.
US4758489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for developing latent electrostatic images
Assignee: Ricoh Co Ltd
•
Filing: 1986-08-18
•
Granted: 1988-07-19
•
Expires: 2006-08-18
Abstract
Abstract A red toner for developing latent electrostatic images is disclosed which comprises a binder agent, C.I. Pigment Red 48 and C.I. Pigment Red 81.
Inventors
- 👤 Masami Tomita
- 👤 Satoru Inoue
- 👤 Akio Matsui
- 👤 Toshiki Nanya
- 👤 Fumihiro Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:21
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0906; G03G9/091; G03G9/0914
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
A red toner comprising a binder agent, C.I. Pigment Red 48 and C.I. Pigment Red 81.
Claim 2
Dependent Claim
16 words
A red toner comprising a binder agent, C.I. Pigment Red 48 and C.I. Pigment Red 81.
Claim 3
Dependent Claim
44 words
The red toner as recited in claim 1, wherein the total content of said C.I. Pigment Red 48 and said C.I. Pigment Red 81 is in the range of 0.1 wt. % to 50 wt. % of the total weight of said red toner.
Claim 4
Dependent Claim
34 words
The red toner as recited in claim 1, wherein the amount ratio by weight of said C.I. Pigment Red 48 to said C.I. Pigment Red 81 is in the range of (2:8) to (8:2).
Claim 5
Dependent Claim
34 words
The red toner as recited in claim 2, wherein the amount ratio by weight of said C.I. Pigment Red 48 to said C.I. Pigment Red 81 is in the range of (2:8) to (8:2).
Claim 6
Dependent Claim
36 words
The red toner as recited in claim 1, wherein said binder agent is selected from the group consisting of polystyrene, chlorinated paraffin, polyvinyl chloride, phenol resin, epoxy resin, polyester, polyamide, polyacrylic acid resin, polyethylene and polypropylene.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |