Patent US2525751A successfully refreshed from Google Patents.
US2525751A
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Light-sensitive diazonium salt materials
Assignee: L L RIDGWAY CO Inc
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Filing: 1947-12-30
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Granted: 1950-10-10
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Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Paul E Spoerri
- 👤 David P Habib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/54
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
A LIGHT-SENSITIVE COMPOUND CONSISTING OF A DIAZO-SALT OF 2:3 DIHYDROXYNAPHTHALENE-6-SULFONIC ACID.
Claim 2
Dependent Claim
11 words
A LIGHT-SENSITIVE COMPOUND CONSISTING OF A DIAZO-SALT OF 2:3 DIHYDROXYNAPHTHALENE-6-SULFONIC ACID.
Claim 3
Dependent Claim
19 words
PHOTO-PRINT PAPER HAVING A LIGHT-SENSITIVE LAYER ON THE SURFACE THEREOF COMPRISED OF THE PDIAZO-DIMETHYLANILINE SALT OF 2:3 DIHYDROXYNAPHTHALENE-6-SULFONIC ACID.
Claim 4
Dependent Claim
19 words
PHOTO-PRINT PAPER HAVING A LIGHT-SENSITIVE LAYER ON THE SURFACE THEREOF COMPRISED OF THE PDIAZO-DIMETHYLANILINE SALT OF 2:3 DIHYDROXYNAPHTHALENE-6-SULFONIC ACID.
References Cited (Backward Citations)
US1628279A
Cited
US1760780A
Cited
US1936957A
Cited
US2196950A
Cited
US2246425A
Cited
US2442061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |