Patent US4576831A successfully refreshed from Google Patents.
US4576831A
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US
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Process for producing heat-sensitive recording paper
Assignee: Fujifilm Holdings Corp
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Filing: 1983-08-23
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Granted: 1986-03-18
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Expires: 2003-08-23
Abstract
Abstract A process for producing a heat-sensitive recording paper is disclosed. The process involves pretreating base paper by a high-frequency corona discharge. The base paper treated in this manner can be utilized in producing a heat-sensitive recording material by providing a heat-sensitive layer thereon. By subjecting the base paper to the high-frequency corona discharge treatment the base paper can be uniformly coated with a heat-sensitive recording material without leaving any blank spaces thereon.
Inventors
- 👤 Noriyuki Hosoi
- 👤 Kensuke Ikeda
- 👤 Hiroharu Matsukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
D; D21; D21H; D21H5/00; D21H5/0005; D21H5/0007; B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/41; D21H23/00; D21H23/02; D21H23/22; D21H23/30; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
A process for producing a heat-sensitive recording paper which comprises pretreating a base paper by a high-frequency corona discharge and then applying an aqueous-type coating solution for forming a heat-sensitive recording layer to the base paper, wherein the high-frequency corona discharge treatment is carried out utilizing a discharge frequency in the range of 5 to 200 KHz and is carried out such that the product of the discharge electric current and the discharge voltage applied to a unit width is in the range of 0.5 KVA/m 2 to 50 KVA/m 2 .
Claim 2
Dependent Claim
92 words
A process for producing a heat-sensitive recording paper which comprises pretreating a base paper by a high-frequency corona discharge and then applying an aqueous-type coating solution for forming a heat-sensitive recording layer to the base paper, wherein the high-frequency corona discharge treatment is carried out utilizing a discharge frequency in the range of 5 to 200 KHz and is carried out such that the product of the discharge electric current and the discharge voltage applied to a unit width is in the range of 0.5 KVA/m 2 to 50 KVA/m 2 .
Claim 3
Dependent Claim
34 words
A process for producing a heat-sensitive recording paper as claimed in claim 1, wherein the high-frequency corona discharge treatment is carried out at a rate in the range of 30 m/min to 1,000 m/min.
Claim 4
Dependent Claim
37 words
A process for producing a heat-sensitive recording paper as claimed in claim 1, wherein the base paper is selected from the group of materials consisting of high-grade paper, middle-grade paper, regenerated paper, coat paper and synthetic paper.
References Cited (Backward Citations)
US3924041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |