Patent US2558285A successfully refreshed from Google Patents.
US2558285A
Expired / Lapsed
US
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Preparation of para-tertiary amino aromatic aldehydes
Assignee: EIDP Inc
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Filing: 1947-07-26
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Granted: 1951-06-26
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Expires: 1967-07-26
Abstract
No abstract record available.
Inventors
- 👤 Cyril D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
C; C07; C07C; C07C47/00; C07C47/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A P-TERTIARY AMINO ALDEHYDE OF THE FORMULA
Claim 2
Dependent Claim
7 words
A P-TERTIARY AMINO ALDEHYDE OF THE FORMULA
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) | 1954-06-25 | 1954-12-25 | 1955-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-25 | 1958-12-25 | 1959-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-25 | 1962-12-25 | 1963-06-26 | $7700.00 | Window Closed / Lapsed |