US3552972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistatic layer for photographic materials
Assignee: Agfa Gevaert AG
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Filing: 1967-11-07
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Granted: 1971-01-05
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Expires: 1987-11-07
Abstract
Abstract CERTAIN POLYGLYCOL DERIVATIVES ARE VERY EFFECTIVE ANTISTATIC AGENTS FOR PHOTOGRAPHIC FILMS CARRYING GELATIN LAYERS. THESE AGENTS ARE OF THE FORMULA: R1(-X-CO-((O-CH2-CH2)N2-O-CH(-CH3)-CH2)M-(O-CH2-CH2)N1- O-R)Y WHEREIN: R IS AN ALKYL HAVING 6-18 CARBON ATOMS, A PHENYL GROUP INCLUDING A SUBSTITUTED PHENYL GROUP; X IS 0 OR AN IMINO GROUP; R1 IS A Y-VALENT ORGANIC GROUP OF THE PHENYL OR NAPHTHYL SERIES; N1 OR N2 IS AN INTEGER FROM 4 TO 8; M IS 0 OR 1 AND Y IS 1, 2, OR 3.
Inventors
- 👤 Karl-Otto Meyer
- 👤 Richard Schiffmann
- 👤 Wolfgang Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89; G03C1/895
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |