Patent US3252998A successfully refreshed from Google Patents.
US3252998A
Expired / Lapsed
US
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Cyclic 5-and 6-membered ethers
Assignee: Studiengesellschaft M B H
•
Filing: 1962-05-10
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Granted: 1966-05-24
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Expires: 1982-05-10
Abstract
No abstract record available.
Inventors
- 👤 Ohloff Gunther
- 👤 Schade Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:37
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/0069; C11B9/0073; C07; C07D; C07D309/00; C07D309/02; C07D309/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
4-METHYL-6-VINYL-2-(2''-METHYLPROPENE-(1'')-YL)-TETRAHYDROPYRAN. 9. 2-METHYL-3-METHYLENE-5-)2''-METHYLPROPENE-(1'')-YL)TETRAHYDROFURAN.
Claim 2
Dependent Claim
3 words
4-METHYL-6-VINYL-2-(2''-METHYLPROPENE-(1'')-YL)-TETRAHYDROPYRAN. 9. 2-METHYL-3-METHYLENE-5-)2''-METHYLPROPENE-(1'')-YL)TETRAHYDROFURAN.
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) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |