US2854337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Raster screen and a process for making the same
Assignee: Individual
•
Filing: 1954-12-02
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Granted: 1958-09-30
•
Expires: 1974-12-02
Abstract
No abstract record available.
Inventors
- 👤 Henry F Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/14; Y; Y10; Y10S; Y10S430/00; Y10S430/147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN A PROCESS FOR PRODUCING A RASTER SCREEN MOLD, THE STEPS OF FORMING ON A METALLIC SURFACE AN ACID RESISTANT COATING HAVING A MULTIPLICITY OF OPENINGS FORMING A PATTERN IN WHICH THE OPENINGS ARE POSITIONED AT THE JOINTURES OF A PLURALITY OF CONTIGUOUS EQUILATERAL TRIANGLES, SUBJECTING THE METALLIC SURFACE AND THE SAID COATING TO REPEATED ETCHING ACTIONS, THEREBY FORMING SPHRICAL DEPRESSIONS IN THE METAL SURFACE AND FORMING OVERHANGING PORTIONS IN THE COATING, REMOVING SAID OVERHANGING PORTIONS, AND REPEATING SAID ETHCING ACTION AND SAID OVERHANG REMOVAL UNTIL THE OPENINGS OF THE SPHERICAL DEPRESSIONS ARE CONTIGUOUS AND SUBSTANTIALLY HEXAGONAL IN OUTLINE AND SAID ACID RESISTANT COATING HAS BEEN REMOVED.
Claim 2
Dependent Claim
107 words
IN A PROCESS FOR PRODUCING A RASTER SCREEN MOLD, THE STEPS OF FORMING ON A METALLIC SURFACE AN ACID RESISTANT COATING HAVING A MULTIPLICITY OF OPENINGS FORMING A PATTERN IN WHICH THE OPENINGS ARE POSITIONED AT THE JOINTURES OF A PLURALITY OF CONTIGUOUS EQUILATERAL TRIANGLES, SUBJECTING THE METALLIC SURFACE AND THE SAID COATING TO REPEATED ETCHING ACTIONS, THEREBY FORMING SPHRICAL DEPRESSIONS IN THE METAL SURFACE AND FORMING OVERHANGING PORTIONS IN THE COATING, REMOVING SAID OVERHANGING PORTIONS, AND REPEATING SAID ETHCING ACTION AND SAID OVERHANG REMOVAL UNTIL THE OPENINGS OF THE SPHERICAL DEPRESSIONS ARE CONTIGUOUS AND SUBSTANTIALLY HEXAGONAL IN OUTLINE AND SAID ACID RESISTANT COATING HAS BEEN REMOVED.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |