Patent US2528656A successfully refreshed from Google Patents.
US2528656A
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US
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1-hydroxy-4, 7-methano-3a, 4, 7, 7a-tetrahydro 4, 5, 6, 7, 8, 8-hexachloroindene andmethod of preparing same
Assignee: Velsicol Corp
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Filing: 1948-07-22
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Granted: 1950-11-07
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Expires: 1968-07-22
Abstract
No abstract record available.
Inventors
- 👤 Simon H Herzfeld
- 👤 Eugene P Ordas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:44
CPC Classifications
C; C07; C07C; C07C23/00; C07C23/18; C07C23/20; C07C23/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AS A NEW COMPOSTION OF MATTER, 1-HYDROXY4,7 - METHANO - 3A,4,7,7A-TETRAHYDRO-4,5,6,7,8,8HEXACHLOROINDENE.
Claim 2
Dependent Claim
11 words
AS A NEW COMPOSTION OF MATTER, 1-HYDROXY4,7 - METHANO - 3A,4,7,7A-TETRAHYDRO-4,5,6,7,8,8HEXACHLOROINDENE.
References Cited (Backward Citations)
US2318033A
Cited
US2278527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |