Patent US4663436A successfully refreshed from Google Patents.
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US2850503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methyl and ethyl n-
Assignee: —
•
Filing: —
•
Granted: 1958-09-02
•
Expires: 1975-09-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:26
CPC Classifications
C; C07; C07D; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING NITRIC ACID WITH A SOLUTION OF ETHYL N-(2-THIAZOLYL) CARBAMATE IN CONCENTRATED SULFURC ACID AT A TEMPERATURE WITHIN THE RANGE OF ABOUT -10*C. TO 10*C. TO PRODUCE ETHYL N-(5-NITRO-2-THIAZOLYL) CARBAMATE.
Claim 2
Dependent Claim
35 words
THE PROCESS WHICH COMPRISES INTIMATELY CONTACTING NITRIC ACID WITH A SOLUTION OF ETHYL N-(2-THIAZOLYL) CARBAMATE IN CONCENTRATED SULFURC ACID AT A TEMPERATURE WITHIN THE RANGE OF ABOUT -10*C. TO 10*C. TO PRODUCE ETHYL N-(5-NITRO-2-THIAZOLYL) CARBAMATE.
References Cited (Backward Citations)
US2531756A
Cited
US2573657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |