US3017296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making photoconductive lead sulfide films
Assignee: Eastman Kodak Co
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Filing: 1957-02-19
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Granted: 1962-01-16
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Expires: 1977-02-19
Abstract
No abstract record available.
Inventors
- 👤 Dunn Joseph Stanley
- 👤 Jr Frank C Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:29
CPC Classifications
H; H10; H10P; H10P95/00; H10F; H10F71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF FORMING A PHOTOSENSITIVE LAYER OF LEAD SULFIDE CRYSTALS WHICH CONMPRISES PRECIPITATING LEAD SULFIDE CRYSTALS ONTO A PREPARED SURFACE BY ADDING A SOLUTION OF THIOUREA CONTAINING SODIUM METABISULFITE TO AN ALKALI METAL HYDROXIDE SOLUTION OF A WATER-SOLUBLE LEAD SALT, SELECTED FROM THE GROUP CONSISTING OF LEAD NITRATE, LEAD ACETATE, LEAD PERCHLORATE, THE TEMPERATURE OF THE COMBINED SOLUTIONS BEING WITHIN THE RANGE OF 5-40* C., THE CONCENTRATIONS IN THE SOLUTIONS WHEN FIRST COMBINED BEING AS FOLLOWS: LEAD BETWEEN 0.05 AND 0.06 MOLAR, ALKALI METAL HYDROXIDE BETWEEN 0.55 AND 0.75 MOLAR, THIOUREA BETWEEN 0.15 AND 0.3 MOLAR, AND SODIUM METABISULFITE BETWEEN 0.005 AND 0.05 MOLAR, BY IMMERSING THE PREPARED SURFACE IN THE COMBINED SOLUTIONS TO RECEIVE PRECIPITATED CRYSTALS OF LEAD SULFIDE AND THEN DRYING THE SURFACE CONTAINING LEAD SULFIDE.
Claim 2
Independent Claim
129 words
THE METHOD OF FORMING A PHOTOSENSITIVE LAYER OF LEAD SULFIDE CRYSTALS WHICH CONMPRISES PRECIPITATING LEAD SULFIDE CRYSTALS ONTO A PREPARED SURFACE BY ADDING A SOLUTION OF THIOUREA CONTAINING SODIUM METABISULFITE TO AN ALKALI METAL HYDROXIDE SOLUTION OF A WATER-SOLUBLE LEAD SALT, SELECTED FROM THE GROUP CONSISTING OF LEAD NITRATE, LEAD ACETATE, LEAD PERCHLORATE, THE TEMPERATURE OF THE COMBINED SOLUTIONS BEING WITHIN THE RANGE OF 5-40* C., THE CONCENTRATIONS IN THE SOLUTIONS WHEN FIRST COMBINED BEING AS FOLLOWS: LEAD BETWEEN 0.05 AND 0.06 MOLAR, ALKALI METAL HYDROXIDE BETWEEN 0.55 AND 0.75 MOLAR, THIOUREA BETWEEN 0.15 AND 0.3 MOLAR, AND SODIUM METABISULFITE BETWEEN 0.005 AND 0.05 MOLAR, BY IMMERSING THE PREPARED SURFACE IN THE COMBINED SOLUTIONS TO RECEIVE PRECIPITATED CRYSTALS OF LEAD SULFIDE AND THEN DRYING THE SURFACE CONTAINING LEAD SULFIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |