US2561284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for obtaining a 5-phenyl-5-lower alkyl hydantoin
Assignee: Parke Davis and Co LLC
•
Filing: 1947-08-23
•
Granted: 1951-07-17
•
Expires: 1967-08-23
Abstract
No abstract record available.
Inventors
- 👤 Loren M Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:20
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
PROCESS FOR OBTAINING A 5-PHENYL-5-LOWER ALKYL HYDANTOIN WHICH COMPRISES REACTING A DRY A-AMINO-A-PHENYL-A-LOWER ALKYL ACETIC ACID WITH DRY FUSED UREA AT A TEMPERATURE AT WHICH A MIXTURE OF DRY UREA AND SAID DRY ACETIC ACID FORM A HOMOGENEOUS LIQUID PHASE.
Claim 2
Dependent Claim
40 words
PROCESS FOR OBTAINING A 5-PHENYL-5-LOWER ALKYL HYDANTOIN WHICH COMPRISES REACTING A DRY A-AMINO-A-PHENYL-A-LOWER ALKYL ACETIC ACID WITH DRY FUSED UREA AT A TEMPERATURE AT WHICH A MIXTURE OF DRY UREA AND SAID DRY ACETIC ACID FORM A HOMOGENEOUS LIQUID PHASE.
References Cited (Backward Citations)
US1861458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |