US2763664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing
Assignee: —
•
Filing: —
•
Granted: 1956-09-18
•
Expires: 1973-09-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:31
CPC Classifications
C; C07; C07D; C07D305/00; C07D305/02; C07D305/10; C07D305/12; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
PROCESS FOR PRODUCING B-BUTYROLACTONE WHICH COMPRISES HYDROGENATING DIKETENE AT A TEMPERATURE IN THE NEIGHBORHOOD OF 0* C. IN THE PRESENCE OF PALLADIUM AS CATALYST.
Claim 2
Dependent Claim
24 words
PROCESS FOR PRODUCING B-BUTYROLACTONE WHICH COMPRISES HYDROGENATING DIKETENE AT A TEMPERATURE IN THE NEIGHBORHOOD OF 0* C. IN THE PRESENCE OF PALLADIUM AS CATALYST.
References Cited (Backward Citations)
US2484498A
Cited
GB688269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |