Patent US4620197A successfully refreshed from Google Patents.
US4620197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink jet recording method
Assignee: Mitsubishi Paper Mills Ltd
•
Filing: 1983-09-15
•
Granted: 1986-10-28
•
Expires: 2003-09-15
Abstract
Abstract By allowing at least the surface of an ink jet recording sheet to contain a cationic fluorescent agent, the waterproofness of water-soluble dyes in inks as well as the brightness of the recording sheet can be enhanced and thereby multicolor images of excellent color reproducibility can be formed on the sheet.
Inventors
- 👤 Shigehiko Miyamoto
- 👤 Yoshinobu Watanabe
- 👤 Yuriko Kishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:37
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/16; G01D15/18; B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5227; B41M5/5245; C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/328; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/25; Y10T428/259
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
In an ink jet recording method which comprises coating an aqueous solution on a surface of a base paper and drying it to obtain a recording sheet and thereafter printing a water-base ink on the aqueous solution-coated surface of the recording sheet, the improvement comprising employing an aqueous solution which contains a cationic fluorescent agent and wherein said water-base ink contains either a water-soluble substantive dye or a water-soluble acid dye.
Claim 2
Dependent Claim
71 words
In an ink jet recording method which comprises coating an aqueous solution on a surface of a base paper and drying it to obtain a recording sheet and thereafter printing a water-base ink on the aqueous solution-coated surface of the recording sheet, the improvement comprising employing an aqueous solution which contains a cationic fluorescent agent and wherein said water-base ink contains either a water-soluble substantive dye or a water-soluble acid dye.
Claim 3
Dependent Claim
18 words
An ink jet recording method according to claim 1, wherein said cationic fluorescent agent is a benzoimidazole derivative.
Claim 4
Dependent Claim
20 words
An ink jet recording method according to claim 1 or 2, wherein said aqueous solution further contains a cationic resin.
Claim 5
Dependent Claim
17 words
An ink jet recording method according to claim 3 wherein the cationic resin is a dicyandiamide condensate.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |