Patent US2562528A successfully refreshed from Google Patents.
US2562528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color former acetals of polyvinyl alcohol and substituted carbalkoxyacetamidobenzaldehydes
Assignee: EIDP Inc
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Filing: 1949-01-21
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Granted: 1951-07-31
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Expires: 1969-01-21
Abstract
No abstract record available.
Inventors
- 👤 Corner James Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:45
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; G03C7/3275
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
THE POLYMERIC ACETALS WHICH CONTAIN INTRALINEAR UNITS OF THE FORMULAE:
Claim 2
Dependent Claim
10 words
THE POLYMERIC ACETALS WHICH CONTAIN INTRALINEAR UNITS OF THE FORMULAE:
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) | 1954-07-30 | 1955-01-29 | 1955-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-30 | 1959-01-29 | 1959-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-30 | 1963-01-29 | 1963-07-31 | $7700.00 | Window Closed / Lapsed |