US2953471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive materials
Assignee: ALSACIENNE DE PAPIERS HELIOGRA
•
Filing: 1957-12-04
•
Granted: 1960-09-20
•
Expires: 1977-12-04
Abstract
No abstract record available.
Inventors
- 👤 Landau Raphael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:10
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD OF PREPARING A DIAZOTYPE PHOTOSENSITIVE MATERIAL COMPRISING FIRST APPLYING TO A BASE MATERIAL A FINELY DIVIDED WATER-SOLUBLE FLUORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, STRONTIUM, MAGNESIUM, ALUMINUM AND ZINC, AND THEN COATING THE BASE MATERIAL WITH A DIAZO SALT AND COUPLING AGENT.
Claim 2
Independent Claim
49 words
A METHOD OF PREPARING A DIAZOTYPE PHOTOSENSITIVE MATERIAL COMPRISING FIRST APPLYING TO A BASE MATERIAL A FINELY DIVIDED WATER-SOLUBLE FLUORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, STRONTIUM, MAGNESIUM, ALUMINUM AND ZINC, AND THEN COATING THE BASE MATERIAL WITH A DIAZO SALT AND COUPLING AGENT.
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) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |