US4013008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and solutions for improvement of offset printing
Assignee: Individual
•
Filing: 1975-03-17
•
Granted: 1977-03-22
•
Expires: 1995-03-17
Abstract
Abstract Disclosed are the uses of polyphosphate solutions as fountain solutions in the dampener roll systems of offset presses and as rub-up solutions for preparing offset plates for storage without corrosion. In the fountain solution application of the invention, the polyphosphate concentration may run from about 0.6 g/l to about 42 g/l; in the plate storage application of the invention it may run from about 6 g/l to about 66 g/l. Particular polyphosphates which are useful in the invention include sodium tripolyphosphate, sodium hexametaphosphate and aminomethylenephosphonate.
Inventors
- 👤 Dorvin Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A method of offset printing with a metal printing plate of the kind which is susceptible to corrosion and which tends to accumulate dirt in the non-image regions thereof, comprising dampening the surface of said plate in the non-image regions thereof with an aqueous polyphosphate solution containing polyphosphate in an amount at least equal to about 0.6 g/l prior to inking said plate and taking an impression therefrom, in which the aqueous polyphosphate solution consists essentially of a concentrate consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
diluted to a use concentration between about 0.6 g/l and about 3 g/l.
Claim 2
Independent Claim
111 words
A method of offset printing with a metal printing plate of the kind which is susceptible to corrosion and which tends to accumulate dirt in the non-image regions thereof, comprising dampening the surface of said plate in the non-image regions thereof with an aqueous polyphosphate solution containing polyphosphate in an amount at least equal to about 0.6 g/l prior to inking said plate and taking an impression therefrom, in which the aqueous polyphosphate solution consists essentially of a concentrate consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
diluted to a use concentration between about 0.6 g/l and about 3 g/l.
Claim 3
Independent Claim
101 words
A method of offset printing with a metal printing plate of the kind which is susceptible to corrosion and which tends to accumulate dirt in the non-image regions thereof, comprising coating said plate with an aqueous polyphosphate solution containing polyphosphate in an amount between about 6 g/l and about 66 g/l, storing the coated plate until needed for use, and rinsing said stored coated plate after storage but prior to use, in which the aqueous polyphosphate solution consists essentially of a concentrate consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
Claim 4
Independent Claim
101 words
A method of offset printing with a metal printing plate of the kind which is susceptible to corrosion and which tends to accumulate dirt in the non-image regions thereof, comprising coating said plate with an aqueous polyphosphate solution containing polyphosphate in an amount between about 6 g/l and about 66 g/l, storing the coated plate until needed for use, and rinsing said stored coated plate after storage but prior to use, in which the aqueous polyphosphate solution consists essentially of a concentrate consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
Claim 5
Dependent Claim
30 words
A concentrate for use in fountain solutions and plate storage solutions consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
Claim 6
Dependent Claim
30 words
A concentrate for use in fountain solutions and plate storage solutions consisting essentially of: ______________________________________
Volume Per Cent
______________________________________
Sodium tripolyphosphate
4.3
Sodium hexametaphosphate
21.5
Aminomethylenephosphonate
0.8
Water 73.4
______________________________________
References Cited (Backward Citations)
US2441653A
Cited
US3354824A
Cited
US3394653A
Cited
US3696746A
Cited
US3775135A
Cited
US3764353A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |