US2834799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing esters of carbamic and carbonic acids
Assignee: Individual
•
Filing: 1955-11-18
•
Granted: 1958-05-13
•
Expires: 1975-11-18
Abstract
No abstract record available.
Inventors
- 👤 Frank J Sowa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:04
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06; C07C68/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
THE METHOD OF PRODUCING ESTERS OF CARBAMIC AND CARBONIC ACID WHICH COMPRISES THE STEP OF BRINGING A UREA CONTAINING THE GROUP
Claim 2
Independent Claim
21 words
THE METHOD OF PRODUCING ESTERS OF CARBAMIC AND CARBONIC ACID WHICH COMPRISES THE STEP OF BRINGING A UREA CONTAINING THE GROUP
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |