Patent US2756227A successfully refreshed from Google Patents.
US2756227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary salts and method of preparation
Assignee: Eastman Kodak Co
•
Filing: 1953-12-28
•
Granted: 1956-07-24
•
Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 Donald W Heseltine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:27
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D277/84; C07D417/00; C07D417/02; C07D417/06; C09; C09B; C09B23/00; C09B23/0008; C09B23/0066; C09B23/0091; C09B23/02; C09B23/04; C09B23/14; C09B23/145; C09B23/146; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A PROCESS FOR MAKING HETEROCYCLIC COMPOUNDS COMPRISING REACTING A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
19 words
A PROCESS FOR MAKING HETEROCYCLIC COMPOUNDS COMPRISING REACTING A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2028141A
Cited
US2107379A
Cited
US2126078A
Cited
US2231659A
Cited
US2450400A
Cited
GB625907A
Cited
US2541015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-24 | 1960-01-23 | 1960-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-24 | 1964-01-23 | 1964-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-24 | 1968-01-23 | 1968-07-24 | $7700.00 | Window Closed / Lapsed |