US2687345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching composition for lithographic plates
Assignee: Printing Developments Inc
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Filing: 1950-11-22
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Granted: 1954-08-24
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Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Margaret H Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:59
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A COMPOSITION CAPABLE OF ETCHING CHROMIUM AND ADAPTED FOR USE IN THE PREPARATION FOR OFFSET PRINTING OF BIMETAL LITHOGRAPHIC PLATES HAVING A CHROMIUM SURFACE AND A GELATINOUS RESIST COATING, SAID COMPOSITION COMPRISING HYDROCHLORIC ACID IN AN AMOUNT TO ETCH CHROMIUM, CALCIUM CHLORIDE IN AN AMOUNT OF AT LEAST ABOUT 80% TO INHIBIT ATTACK OF THE RESIST BY HYDROCHLORIC ACID AND AN ALIPHATIC ALCOHOL HAVING FROM TWO TO FOUR CARBON ATOMS IN AN AMOUNT OF AT LEAST 5% TO SUBSTANTIALLY PREVENT CRYSTALLIZATION OF CALCIUM CHLORIDE AT THE ETCHING TEMPERATURE.
Claim 2
Dependent Claim
88 words
A COMPOSITION CAPABLE OF ETCHING CHROMIUM AND ADAPTED FOR USE IN THE PREPARATION FOR OFFSET PRINTING OF BIMETAL LITHOGRAPHIC PLATES HAVING A CHROMIUM SURFACE AND A GELATINOUS RESIST COATING, SAID COMPOSITION COMPRISING HYDROCHLORIC ACID IN AN AMOUNT TO ETCH CHROMIUM, CALCIUM CHLORIDE IN AN AMOUNT OF AT LEAST ABOUT 80% TO INHIBIT ATTACK OF THE RESIST BY HYDROCHLORIC ACID AND AN ALIPHATIC ALCOHOL HAVING FROM TWO TO FOUR CARBON ATOMS IN AN AMOUNT OF AT LEAST 5% TO SUBSTANTIALLY PREVENT CRYSTALLIZATION OF CALCIUM CHLORIDE AT THE ETCHING TEMPERATURE.
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) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |