US3213112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrahydrofurans
Assignee: Airco Inc
•
Filing: 1956-02-17
•
Granted: 1965-10-19
•
Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Neeley
- 👤 Russell K Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:50
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/10; C07D307/12; C07D307/18; C07D307/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
16 words
AS A NEW CLASS OF CHEMICAL COMPOUNDS, THE COMPOUNDS HAVING THE COMPOSITION REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US2105808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |