US3697528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation sensitive materials containing bipyridilium salt of a strong acid
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-05-26
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Granted: 1972-10-10
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Expires: 1990-05-26
Abstract
Abstract A radiation sensitive material based on nitrogeneous dications such as bipyridyls, preferably with a water soluble polymer as a support. Sensitisers and desensitisers are described. The materials are sensitive to X-rays, electrons and UV up to about 500 nm, in the presence of sensitisers.
Inventors
- 👤 Timothy Douglas Andrews
- 👤 Glyn David Short
- 👤 Ieuan Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/22; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0627; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
4 words
N,N''-bis (p-cyanophenyl) bipyridilium chloride.
References Cited (Backward Citations)
US3622477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |