US2618657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process o
Assignee: —
•
Filing: —
•
Granted: 1952-11-18
•
Expires: 1969-11-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:28
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02; C07C215/00; C07C215/02; C07C215/22; C07C215/28; C07C215/30; C10; C10M; C10M159/00; C10M159/12; C10M159/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
A COMPOUND REPRESENTED BY THE STRUCTURAL FORMULA
References Cited (Backward Citations)
NL22184C
Cited
NL22101C
Cited
GB249717A
Cited
CH131250A
Cited
US1757394A
Cited
US1841674A
Cited
DE514747C
Cited
GB302984A
Cited
DE538456C
Cited
GB432480A
Cited
US2129525A
Cited
US2256806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |