US2801252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2, 5-dialkoxy-dihydrofurans and tetrahydrofurans
Assignee: Sadolin and Holmblad AS
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Filing: 1954-01-11
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Granted: 1957-07-30
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Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 Niels K F W Clauson-Kaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:22
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/69; C07C; C07C37/00; C07C37/06; C07C37/07; C07C45/00; C07C45/56; C07C45/57; C07C45/59; C07D211/00; C07D211/04; C07D211/68; C07D211/72; C07D211/74; C07D211/76; C07D211/92; C07D211/94; C07D213/89; C07D307/00; C07D307/02; C07D307/04; C07D307/18; C07D307/20; C07D307/26; C07D307/30; C07D307/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
PRODUCTS SELECTED FROM THE GROUP CONSISTING OF 2,5DI-RO-2-(A,A-DI-RO-ETHYL)-2,5-DIHYDROFURAN AND 2,5-DIRO-2-(A,A-DI-RO-ETHYL)-TETRAHYDROFURAN, WHERE R IS SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL.
Claim 2
Dependent Claim
22 words
PRODUCTS SELECTED FROM THE GROUP CONSISTING OF 2,5DI-RO-2-(A,A-DI-RO-ETHYL)-2,5-DIHYDROFURAN AND 2,5-DIRO-2-(A,A-DI-RO-ETHYL)-TETRAHYDROFURAN, WHERE R IS SELECTED FROM THE GROUP CONSISTING OF METHYL AND ETHYL.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |