Patent US2500155A successfully refreshed from Google Patents.
US2500155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of esters of cyclic
Assignee: —
•
Filing: —
•
Granted: 1950-03-14
•
Expires: 1967-03-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:46
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/04; C07D319/06; C07D317/00; C07D317/08; C07D317/10; C07D317/14; C07D317/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
THE PROCESS WHICH COMPRISES REACTING BY HEATING TOGETHER IN THE PRESENCE OF AN ACIDIC CATALYST (A) AN ESTER OF THE FORMULA
Claim 2
Dependent Claim
21 words
THE PROCESS WHICH COMPRISES REACTING BY HEATING TOGETHER IN THE PRESENCE OF AN ACIDIC CATALYST (A) AN ESTER OF THE FORMULA
References Cited (Backward Citations)
US2447975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |