US2916501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrahydropyrans
Assignee: Dow Chemical Co
•
Filing: 1958-02-03
•
Granted: 1959-12-08
•
Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 Dale N Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/02; C07D309/08; C07D309/10; C07D309/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
GAMMA-TETRAHYDROPYRANLOXY-ALPHA, BETA-ACETYLENIC KETONES HAVING THE FORMULA
Claim 2
Dependent Claim
6 words
GAMMA-TETRAHYDROPYRANLOXY-ALPHA, BETA-ACETYLENIC KETONES HAVING THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |