Patent US2644822A successfully refreshed from Google Patents.
US2644822A
Expired / Lapsed
US
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2, 3-bis-(oxybenzyl)-butane derivatives
Assignee: Sulphite Products Corp
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Filing: 1949-08-26
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Granted: 1953-07-07
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Expires: 1969-08-26
Abstract
No abstract record available.
Inventors
- 👤 Irwin A Pearl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:20
CPC Classifications
C; C11; C11B; C11B5/00; C11B5/0021; C11B5/0035; C07; C07C; C07C39/00; C07C39/12; C07C39/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
3 words
THE PRODUCT 2,3-BIS-(3,4-METHYLENEDIOXYBENZYL)-2,3-BUTANEDIOL.
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) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |