Patent US2552567A successfully refreshed from Google Patents.
US2552567A
Expired / Lapsed
US
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Dienophilic addition products of ketals of cyclic chlorocarbon ketones
Assignee: Purdue Research Foundation
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Filing: 1948-10-01
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Granted: 1951-05-15
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Expires: 1968-10-01
Abstract
No abstract record available.
Inventors
- 👤 Earl T Mcbee
- 👤 Jack S Newcomer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/02; C07C23/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
15 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) 1,4,5,6-TETRACHLORO-7,7-DIALKOXYBICYCLO(2.2.1)-5-HEPTENE-2,3-DICARBOXYLIC ACIDS AND (B) ANHYDRIDES THEREOF.
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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |