US2819284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain substituted cyclic amidines
Assignee: Baker Petrolite LLC
•
Filing: 1955-07-11
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Granted: 1958-01-07
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Expires: 1975-07-11
Abstract
No abstract record available.
Inventors
- 👤 Shen Kwan-Ting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:22
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D233/00; C07D233/04; C07D233/20; C07D233/24; Y; Y10; Y10S; Y10S507/00; Y10S507/939; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
DISUBSTITUTED CYCLIC AMIDINES OF THE CLASS OF TETRAHYDROPYRIMIDINES AND AMINOIMIDAZOLINES OF THE STRUCTURE
Claim 2
Dependent Claim
13 words
DISUBSTITUTED CYCLIC AMIDINES OF THE CLASS OF TETRAHYDROPYRIMIDINES AND AMINOIMIDAZOLINES OF THE STRUCTURE
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) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |