Patent US2516626A successfully refreshed from Google Patents.
US2516626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrahydropyrimidine compounds
Assignee: —
•
Filing: —
•
Granted: 1950-07-25
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:36
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D239/24; C07D239/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
THE METHOD OF PRODUCING 2,2,4,4,6-PENTAMETHYLTETRAHYDROPYRIMIDINE, SAID METHOD COMPRISING REACTING AMMONIA WITH ACETONE IN THE PRESENCE OF AN ACIDIC CONDENSATION CATALYST.
Claim 2
Independent Claim
20 words
THE METHOD OF PRODUCING 2,2,4,4,6-PENTAMETHYLTETRAHYDROPYRIMIDINE, SAID METHOD COMPRISING REACTING AMMONIA WITH ACETONE IN THE PRESENCE OF AN ACIDIC CONDENSATION CATALYST.
Claim 3
Dependent Claim
6 words
AS A NEW CHEMICAL COMPOUND, 2,2,4,4,6PENTAMETHYLTETRAHYDROPYRIMIDINE.
Claim 4
Dependent Claim
6 words
AS A NEW CHEMICAL COMPOUND, 2,2,4,4,6PENTAMETHYLTETRAHYDROPYRIMIDINE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |