US4253682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive copying paper sheets
Assignee: Bayer AG
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Filing: 1979-03-13
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Granted: 1981-03-03
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Expires: 1999-03-13
Abstract
Abstract Pressure-sensitive copying paper containing a solution of a dye-precursor agent in microencapsulated form, wherein the dye-precursor agent is dissolved in a hydrophobic organic solvent and encapsulated in capsules composed of the polyaddition product of a diisocyanate of Formula (I) ##STR1## wherein R represents a divalent aliphatic radical, and a diamine.
Inventors
- 👤 Gunther Baatz
- 👤 Walter Schafer
- 👤 Kurt Findeisen
- 👤 Manfred Dahm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/165; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/16; C; C07; C07D; C07D273/00; C07D273/02; C07D273/04; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7875; C08G18/7887; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A pressure-sensitive copying paper comprising a solution of a dye-precursor agent in microencapsulated form, wherein the dyeprecursor agent is encapsulated as a solution in a hydrophobic organic solvent in microcapsules comprised of the polyaddition product of a diamine and a diisocyanate of formula ##STR4## wherein R is n-hexylene.
Claim 2
Dependent Claim
48 words
A pressure-sensitive copying paper comprising a solution of a dye-precursor agent in microencapsulated form, wherein the dyeprecursor agent is encapsulated as a solution in a hydrophobic organic solvent in microcapsules comprised of the polyaddition product of a diamine and a diisocyanate of formula ##STR4## wherein R is n-hexylene.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |