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Patent US2561378A successfully refreshed from Google Patents.
US2561378A
Expired / Lapsed
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20-dimethylamino-pregnenes and their quaternary halides
Assignee: Akzo Nobel Paints LLC
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Filing: 1947-09-11
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Granted: 1951-07-24
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Expires: 1967-09-11
Abstract
No abstract record available.
Inventors
- 👤 Percy L Julian
- 👤 Helen C Printy
- 👤 Edwin W Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:55
CPC Classifications
C; C07; C07J; C07J41/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
PREGNENE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF 2-DIMETHYLAMINO-5-PREGNENES AND THEIR QUATERNARY AMMONIUM HALIDES OTHER THAN QUATERNARY AMMONIUM FLUORIDES.
Claim 2
Dependent Claim
19 words
PREGNENE COMPOUNDS SELECTED FROM THE CLASS CONSISTING OF 2-DIMETHYLAMINO-5-PREGNENES AND THEIR QUATERNARY AMMONIUM HALIDES OTHER THAN QUATERNARY AMMONIUM FLUORIDES.
References Cited (Backward Citations)
US2252863A
Cited
US2481524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |