Patent US5331511A successfully refreshed from Google Patents.
US3134673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developers
Assignee: Ilford Imaging UK Ltd
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Filing: 1961-02-10
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Granted: 1964-05-26
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Expires: 1981-02-10
Abstract
No abstract record available.
Inventors
- 👤 Ganguin Karl Otto
- 👤 Crichton David William
- 👤 Kaye Albert Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:22
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/08; C07D295/096; C07D215/00; C07D215/02; C07D215/16; C07D215/20; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021
Claims Analysis
Total Claims: 0
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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) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |