US4285276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for printing employing lithographic fountain dampening solution
Assignee: Individual
•
Filing: 1980-04-11
•
Granted: 1981-08-25
•
Expires: 2000-04-11
Abstract
Abstract Method for lithographic printing wherein a lithographic printing plate having oleophilic and hydrophilic areas on the printing surface of the plate is contacted with ink and an aqueous fountain solution during printing. An aqueous solution comprising an enzyme is used as the fountain solution.
Inventors
- 👤 Howard A. Fromson
- 👤 Robert F. Gracia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:39
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
In a method for lithographic printing wherein a lithographic printing plate having oleophilic and hydrophilic areas on the printing surface of the plate is contacted with ink and an aqueous fountain dampening solution during printing, the improvement comprising, as said fountain solution an aqueous solution containing a water-soluble hydrolase enzyme dissolved therein to improve printing quality and reduce the amount of fountain solution necessary to dampen the plate.
Claim 2
Dependent Claim
68 words
In a method for lithographic printing wherein a lithographic printing plate having oleophilic and hydrophilic areas on the printing surface of the plate is contacted with ink and an aqueous fountain dampening solution during printing, the improvement comprising, as said fountain solution an aqueous solution containing a water-soluble hydrolase enzyme dissolved therein to improve printing quality and reduce the amount of fountain solution necessary to dampen the plate.
Claim 3
Dependent Claim
24 words
Method of claim 1 wherein the water soluble enzyme is selected from the group consisting of pepsin, lipase, protease, amylase, diastase, papain and rapidase.
Claim 4
Dependent Claim
11 words
Method of claim 1 wherein the water soluble enzyme is pepsin.
Claim 5
Dependent Claim
17 words
Method of claim wherein the fountain dampening solution contains 0.05 to 5 weight percent of said enzyme.
Claim 6
Dependent Claim
17 words
Method of claim 1 wherein the fountain dampening solution also comprises an effective amount of an alcohol.
References Cited (Backward Citations)
US2044156A
Cited
US2334098A
Cited
US2387056A
Cited
US3257941A
Cited
US3289577A
Cited
US3354824A
Cited
US3557002A
Cited
US3522062A
Cited
US3620737A
Cited
US3532599A
Cited
US3813342A
Cited
US3681197A
Cited
US3775135A
Cited
US3625715A
Cited
US3687694A
Cited
US3829319A
Cited
US3877374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |