US4340660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner for development having crosslinked polymers
Assignee: Canon Inc
•
Filing: 1980-04-28
•
Granted: 1982-07-20
•
Expires: 2000-04-28
Abstract
Abstract A toner for development comprises a crosslinked vinyl polymer having a gel content of 50-99% and a crosslinked vinyl polymer having a gel content of 10-0%.
Inventors
- 👤 Masashi Kiuchi
- 👤 Yoshio Takasu
- 👤 Hiroshi Fukumoto
- 👤 Takashi Hino
- 👤 Masaki Uchiyama
- 👤 Yasuo Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:50
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08793
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
In a toner for development comprising a resin and a colorant, the improvement wherein said resin comprises a first crosslinked vinyl polymer having a gel content of 50-99% and a second crosslinked vinyl polymer having a gel content of 10-0%, said polymers being in a weight ratio ranging from 10:90 to 90:10.
Claim 2
Dependent Claim
52 words
In a toner for development comprising a resin and a colorant, the improvement wherein said resin comprises a first crosslinked vinyl polymer having a gel content of 50-99% and a second crosslinked vinyl polymer having a gel content of 10-0%, said polymers being in a weight ratio ranging from 10:90 to 90:10.
Claim 3
Dependent Claim
20 words
A toner according to claim 1 in which the gel content of said first polymer ranges from 70 to 95%.
Claim 4
Dependent Claim
20 words
A toner according to claim 1 in which the gel content of said second polymer ranges from 5 to 0%.
Claim 5
Dependent Claim
17 words
A toner according to claim 1 in which the molecular weight of said vinyl polymers is 5,000-1,000,000.
Claim 6
Dependent Claim
30 words
A toner according to claim 1 in which the weight ratio of said first crosslinked vinyl polymer to that of said second crosslinked vinyl polymer ranges from 20:80 to 80:20.
Claim 7
Dependent Claim
13 words
A toner according to claim 1 in which said colorant is magnetic powder.
Claim 8
Dependent Claim
21 words
A toner according to claim 6 in which the amount of magnetic powder is 1-60% by weight based on the toner.
References Cited (Backward Citations)
US2297691A
Cited
US2825814A
Cited
US3220831A
Cited
US3220324A
Cited
GB1165405A
Cited
GB1165406A
Cited
US3965021A
Cited
US3974078A
Cited
US3941898A
Cited
US3965022A
Cited
US3980576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |