US2750427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halohydroquinones and preparation thereof
Assignee: Monsanto Chemicals Ltd
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Filing: 1953-11-18
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Granted: 1956-06-12
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Expires: 1973-11-18
Abstract
No abstract record available.
Inventors
- 👤 Van R Gaertner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/06; C07C37/07; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
5,6,7,8-TETRAHYDRO-1,4-NAPHTHOHYDROQUINONES CONTAINING AT LEAST 1 NUCLEAR HALOGEN ATOM ATTACHED TO THE AROMATIC RING.
Claim 2
Dependent Claim
13 words
5,6,7,8-TETRAHYDRO-1,4-NAPHTHOHYDROQUINONES CONTAINING AT LEAST 1 NUCLEAR HALOGEN ATOM ATTACHED TO THE AROMATIC RING.
Claim 3
Independent Claim
72 words
THE METHOD OF PREPARING A 5,8-DIHYDRO-1,4NAPHTHYDROQUINONE CONTAINING AT LEAST ONE NUCLEAR HALOGEN ATOM ATTACHED TO THE AROMATIC RING, WHICH METHOD COMPRISES CATALYTICALLY HYDROGENATING A 4A,5,8,8A-TETRAHYDRO-1,4-NAPHTHOQUINONE CONTAINING AT LEAST TWO HALOGEN ATOMS ON NUCLEAR CARBON ATOMS WHICH ARE IN ALPHA POSITIONS TO A CARBONYL GROUP, AT LEAST ONE OF SAID HALOGENS BEING A VINYL HALOGEN AND AT LEAST ONE OF SAID HALOGENS BEING AN ANGULAR SUBSTITUENT IN CIS-RELATIONSHIP WITH THE OTHER ANGULAR SUBSTITUENT.
Claim 4
Independent Claim
72 words
THE METHOD OF PREPARING A 5,8-DIHYDRO-1,4NAPHTHYDROQUINONE CONTAINING AT LEAST ONE NUCLEAR HALOGEN ATOM ATTACHED TO THE AROMATIC RING, WHICH METHOD COMPRISES CATALYTICALLY HYDROGENATING A 4A,5,8,8A-TETRAHYDRO-1,4-NAPHTHOQUINONE CONTAINING AT LEAST TWO HALOGEN ATOMS ON NUCLEAR CARBON ATOMS WHICH ARE IN ALPHA POSITIONS TO A CARBONYL GROUP, AT LEAST ONE OF SAID HALOGENS BEING A VINYL HALOGEN AND AT LEAST ONE OF SAID HALOGENS BEING AN ANGULAR SUBSTITUENT IN CIS-RELATIONSHIP WITH THE OTHER ANGULAR SUBSTITUENT.
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) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |