US3178441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyridyl-pyrazolidine 3-ones
Assignee: Ilford Imaging UK Ltd
•
Filing: 1962-12-10
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Granted: 1965-04-13
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Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ficken Geoffrey Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:07
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A PYRAZOLIDIN-3-ONE COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
6 words
A PYRAZOLIDIN-3-ONE COMPOUND OF THE FORMULA:
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |