US2549453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anhydride synthesis
Assignee: EIDP Inc
•
Filing: 1947-02-28
•
Granted: 1951-04-17
•
Expires: 1967-02-28
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
- 👤 Richard E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:49
CPC Classifications
C; C07; C07C; C07C61/00; C07C61/16; C07C61/22; C07C51/00; C07C51/10; C07C51/14; C07C51/54; C07C51/56; C07C53/00; C07C53/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
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
Claim 2
Dependent Claim
155 words
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
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |