Patent US2569985A successfully refreshed from Google Patents.
US2569985A
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Thiourea-ketone complexes
Assignee: Shell Development Co
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Filing: 1948-02-16
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Granted: 1951-10-02
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Expires: 1968-02-16
Abstract
No abstract record available.
Inventors
- 👤 Lloyd C Fetterly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
C; C07; C07C; C07C335/00; C07C335/02; C07C45/00; C07C45/78; C07C45/85
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
AS A NEW COMPOSITION OF MATTER, A CRYSTALLINE COMPLEX OF THIOUREA WITH AN ALIPHATIC KETONE SELECTED FROM THE GROUP CONSISTING OF METHYL ISOBUTYL KETONE, DIISOPROPYL KETONE, DIETHYL KETONE, METHYL N-PROPYL KETONE AND MESITYL OXIDE.
Claim 2
Dependent Claim
34 words
AS A NEW COMPOSITION OF MATTER, A CRYSTALLINE COMPLEX OF THIOUREA WITH AN ALIPHATIC KETONE SELECTED FROM THE GROUP CONSISTING OF METHYL ISOBUTYL KETONE, DIISOPROPYL KETONE, DIETHYL KETONE, METHYL N-PROPYL KETONE AND MESITYL OXIDE.
References Cited (Backward Citations)
US2047144A
Cited
US2499820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |