US4150996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic fountain concentrate
Assignee: 3M Co
•
Filing: 1977-08-05
•
Granted: 1979-04-24
•
Expires: 1997-08-05
Abstract
Abstract A fountain concentrate for preparing a dampening or fountain solution for lithography, consisting essentially of a mixture of a desensitizer, sulfanilic acid, and formaldehyde.
Inventors
- 👤 Leonard J. Druker
- 👤 Robert B. Kincaid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:30
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
32 words
A fountain concentrate which when diluted with water is capable of providing an acidic fountain solution for lithography, said concentrate consisting essentially of a mixture of sulfanilic acid, formaldehyde, and a desensitizer.
Claim 2
Dependent Claim
32 words
A fountain concentrate which when diluted with water is capable of providing an acidic fountain solution for lithography, said concentrate consisting essentially of a mixture of sulfanilic acid, formaldehyde, and a desensitizer.
Claim 3
Dependent Claim
15 words
The concentrate of claim 1 further including a minor amount of a water-soluble alkaline material.
Claim 4
Dependent Claim
12 words
The concentrate of claim 2 wherein said alkaline material is sodium hydroxide.
Claim 5
Dependent Claim
12 words
The concentrate of claim 1 wherein said desensitizer is a hydrophilic colloid.
Claim 6
Dependent Claim
11 words
The concentrate of claim 4 wherein said colloid is gum arabic.
Claim 7
Dependent Claim
32 words
A fountain solution for lithography, said fountain solution having a pH of from about 3.5 to about 5.0 and consisting essentially of a mixture of sulfanilic acid, formaldehyde, water, and a desensitizer.
Claim 8
Dependent Claim
32 words
A fountain solution for lithography, said fountain solution having a pH of from about 3.5 to about 5.0 and consisting essentially of a mixture of sulfanilic acid, formaldehyde, water, and a desensitizer.
Claim 9
Dependent Claim
13 words
The fountain solution of claim 6 wherein said desensitizer is a hydrophilic colloid.
Claim 10
Dependent Claim
12 words
The fountain solution of claim 7 wherein said colloid is gum arabic.
Claim 11
Dependent Claim
16 words
The fountain solution of claim 6 further including a minor amount of a water-soluble alkaline material.
Claim 12
Dependent Claim
13 words
The fountain solution of claim 9 wherein said alkaline material is sodium hydroxide.
References Cited (Backward Citations)
US2197357A
Cited
US2550639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |