US3221023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
(2-hydroxymethyl-3-pyrazolidones)
Assignee: Eastman Kodak Co
•
Filing: 1961-05-01
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Granted: 1965-11-30
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Marle David Joseph De
- 👤 Donovan Thomas Starr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:18
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; C07D231/08; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035; G03C8/00; G03C8/02; G03C8/04; G03C8/06; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A COMPOUND HAVING 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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |