US4327148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained color forming pressure sensitive record paper of the single coating type
Assignee: Appvion LLC
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Filing: 1979-11-28
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Granted: 1982-04-27
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Expires: 1999-11-28
Abstract
Abstract A self-contained color forming pressure sensitive record paper of the single coating type which has on one side of a support a coating layer of a mixture of color former-containing microcapsules and color developer-containing microcapsules, as well as a powdered polyolefin. The powdered polyolefin acts as capsule protecting agent and prevents the smudging due to unintentional color development caused by the rapture of the capsules.
Inventors
- 👤 Kohji Toyama
- 👤 Mitsuru Fuchigami
- 👤 Isao Nagayasu
- 👤 Hirokazu Tsukahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:33
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/1243; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/254; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A self-contained color forming pressure sensitive record paper of the single coating type prepared by coating a base paper sheet with a uniform coating mixture of an aqueous suspension of microcapsules containing a color former and an aqueous suspension of microcapsules containing a color developer and then drying, characterized by adding a powdered polyolefin having a particle diameter of 5 to 30μ as a microcapsule protective
Claim 2
Dependent Claim
66 words
A self-contained color forming pressure sensitive record paper of the single coating type prepared by coating a base paper sheet with a uniform coating mixture of an aqueous suspension of microcapsules containing a color former and an aqueous suspension of microcapsules containing a color developer and then drying, characterized by adding a powdered polyolefin having a particle diameter of 5 to 30μ as a microcapsule protective
Claim 3
Dependent Claim
25 words
A record paper according to claim 1 wherein a portion of the powdered polyolefin is replaced by at most 70% by weight of starch particles.
Claim 4
Dependent Claim
35 words
A record paper according to claim 1, wherein the powdered polyolefin contains a major amount of polyethylene, has an average particle diameter of 10 to 30μ and is added in the form of aqueous dispersion.
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) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |