Patent US2574444A successfully refreshed from Google Patents.
US2574444A
Expired / Lapsed
US
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Substituted aryl 6-tetrahydropyranyl ethers
Assignee: Shell Development Co
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Filing: 1948-12-27
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Granted: 1951-11-06
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Expires: 1968-12-27
Abstract
No abstract record available.
Inventors
- 👤 Richard R Whetstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:22
CPC Classifications
C; C07; C07D; C07D309/00; C07D309/02; C07D309/08; C07D309/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A CHEMICAL COMPOUND HAVING A STRUTURE DIFINED BY THE FORMULA
Claim 2
Dependent Claim
10 words
A CHEMICAL COMPOUND HAVING A STRUTURE DIFINED BY THE FORMULA
References Cited (Backward Citations)
US2455776A
Cited
US2489729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |