Patent US2809218A successfully refreshed from Google Patents.
US2809218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ohach
Assignee: —
•
Filing: —
•
Granted: 1957-10-08
•
Expires: 1974-10-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:11
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/30; C07C43/313; C07C41/00; C07C41/48; C07C41/50; C07C43/303; C07C43/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
THE UNSYMMETRICAL TRIFLUOROETHYL ALKYL ACETALS OF ACETALDEHYDE REPRESENTED BY THE FORMULA
Claim 2
Dependent Claim
11 words
THE UNSYMMETRICAL TRIFLUOROETHYL ALKYL ACETALS OF ACETALDEHYDE REPRESENTED BY THE FORMULA
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |