US3287128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic plates and coatings
Assignee: Lockheed Martin Corp
•
Filing: 1963-04-22
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Granted: 1966-11-22
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Expires: 1983-04-22
Abstract
No abstract record available.
Inventors
- 👤 Phyllis T Lugasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/008; G03F7/012; G03F7/0125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN THE METHOD OF PREPARING A DEEP-ETCHED LITHOGRAPHIC PLATE WHICH COMPRISES APPLYING A PHOTOSENSITIVE COATING COMPOSITION TO A BASE PLATE, HARDENING AT LEAST A PORTION OF SAID COATING BY EXPOSING SELECTED AREAS OF THE COATING TO LIGHT, DISSOLVING THE UNHARDENED PORTIONS OF THE COATING, DEEP-ETCHING THE UNCOATED PORTIONS OF THE BASE PLATE, APPLYING A LITHOGRAPHIC INK AND REMOVING THE REMAINING PORTIONS OF THE COATING FROM THE BASE PLATE WHEREBY THE IMAGE AREAS OF THE LITHOGRAPHIC PLATE ARE RENDERED OLEPHYLIC AND THE NON-IMAGING AREAS ARE RENDERED HYDROPHYLIC, THE IMPROVEMENT WHICH COMPRISES USING AS THE PHOTOSENSITIVE COATING COMPOSITION AS AQUEOUS SOLUTION OF A WATER-SOLUBLE HYDROXYALKYL ETHER OF CELLULOSE IN WHICH THE ALKYL GROUPS CONTAIN FROM TWO TO FIVE CARBON ATOMS, AND A WATER-SOLUBLE SALT OF AN AROMATIC DIAZIDE, SAID HYDROXYALKYL ETHER OF CELLULOSE EXHIBITING IN 2% AQUEOUS SOLUTION AT 25*C. A VISOCITY OF LESS THAN 200 CENTIPOISES.
Claim 2
Dependent Claim
145 words
IN THE METHOD OF PREPARING A DEEP-ETCHED LITHOGRAPHIC PLATE WHICH COMPRISES APPLYING A PHOTOSENSITIVE COATING COMPOSITION TO A BASE PLATE, HARDENING AT LEAST A PORTION OF SAID COATING BY EXPOSING SELECTED AREAS OF THE COATING TO LIGHT, DISSOLVING THE UNHARDENED PORTIONS OF THE COATING, DEEP-ETCHING THE UNCOATED PORTIONS OF THE BASE PLATE, APPLYING A LITHOGRAPHIC INK AND REMOVING THE REMAINING PORTIONS OF THE COATING FROM THE BASE PLATE WHEREBY THE IMAGE AREAS OF THE LITHOGRAPHIC PLATE ARE RENDERED OLEPHYLIC AND THE NON-IMAGING AREAS ARE RENDERED HYDROPHYLIC, THE IMPROVEMENT WHICH COMPRISES USING AS THE PHOTOSENSITIVE COATING COMPOSITION AS AQUEOUS SOLUTION OF A WATER-SOLUBLE HYDROXYALKYL ETHER OF CELLULOSE IN WHICH THE ALKYL GROUPS CONTAIN FROM TWO TO FIVE CARBON ATOMS, AND A WATER-SOLUBLE SALT OF AN AROMATIC DIAZIDE, SAID HYDROXYALKYL ETHER OF CELLULOSE EXHIBITING IN 2% AQUEOUS SOLUTION AT 25*C. A VISOCITY OF LESS THAN 200 CENTIPOISES.
References Cited (Backward Citations)
FR886716A
Cited
US2584317A
Cited
US2687958A
Cited
DE838699C
Cited
US2692826A
Cited
US2848328A
Cited
US3118765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |