Patent US2858322A successfully refreshed from Google Patents.
US2858322A
Expired / Lapsed
US
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Process for the preparation of 3, 4-dihydro-1, 2-h-pyrans
Assignee: Union Carbide Corp
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Filing: 1956-11-13
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Granted: 1958-10-28
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Expires: 1976-11-13
Abstract
No abstract record available.
Inventors
- 👤 Donald G Kubler
- 👤 Amelio E Montagna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:42
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/16; C07D309/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
13 words
PROCESS FOR PREPARING 3,4-DIHYDRO-1,2-H-PYRANS WHICH COMPRISES PASSING A 2-ALKOXYTETRAHYDROPYRAN HAVING THE GENERAL 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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |