Patent US2637929A successfully refreshed from Google Patents.
US2637929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing lithographic printing plates
Assignee: Individual
•
Filing: 1950-04-27
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Granted: 1953-05-12
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Expires: 1970-04-27
Abstract
No abstract record available.
Inventors
- 👤 Walter J Hausman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PRODUCING A LITHOGRAPHIC PLATE WHICH COMPRISES BRUSHING ONE SIDE OF A SHEET OF AT LEAST 99% PURE ALUMINUM WITH A FIRST BRUSH HAVING RELATIVELY COARSE STEEL BRISTLES TO TEAR THE SKIN OF THE SHEET AND TO FORM A COARSE GRAIN, BRUSHING SAID SIDE OF SAID SHEET WITH A STEEL BRUSH HAVING RELATIVELY FINER BRISTLES TO SUBDUE THE COARSE GRAIN FORMED BY SAID FIRST BRUSH, IMMERSING SAID SHEET IN A SATURATED AQUEOUS SOLUTION OF CALCIUM HYDROXIDE MAINTAINED AT A TEMPERATURE BETWEEN 175* F. AND 185* F. FOR A PERIOD OF FROM ABOUT 25 SECOND TO ABOUT 55 SECONDS, AND WATER SCRUBBING AND DRYING SAID PLATE.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PRODUCING A LITHOGRAPHIC PLATE WHICH COMPRISES BRUSHING ONE SIDE OF A SHEET OF AT LEAST 99% PURE ALUMINUM WITH A FIRST BRUSH HAVING RELATIVELY COARSE STEEL BRISTLES TO TEAR THE SKIN OF THE SHEET AND TO FORM A COARSE GRAIN, BRUSHING SAID SIDE OF SAID SHEET WITH A STEEL BRUSH HAVING RELATIVELY FINER BRISTLES TO SUBDUE THE COARSE GRAIN FORMED BY SAID FIRST BRUSH, IMMERSING SAID SHEET IN A SATURATED AQUEOUS SOLUTION OF CALCIUM HYDROXIDE MAINTAINED AT A TEMPERATURE BETWEEN 175* F. AND 185* F. FOR A PERIOD OF FROM ABOUT 25 SECOND TO ABOUT 55 SECONDS, AND WATER SCRUBBING AND DRYING SAID PLATE.
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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |