US2541473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chzxchs
Assignee: —
•
Filing: —
•
Granted: 1951-02-13
•
Expires: 1968-02-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:15
CPC Classifications
C; C07; C07D; C07D401/00; C07D401/02; C07D401/12; C07D295/00; C07D295/04; C07D295/10; C07D295/112; C07D295/116; C07C; C07C225/00; C07C225/24; C07C225/26; C07C225/30; C07D211/00; C07D211/04; C07D211/06; C07D211/08; C07D211/18; C07D211/30; C07D211/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
5 words
COMPOUND OF THE GENERAL FORMULA
Claim 3
Independent Claim
42 words
THE METHOD WHICH COMPRISES REACTING 2HYDROXY-1,4-NAPHTHOQUINONE WITH FORMALDEHYDE AND A NITROGEN-CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL- AND DI-ALKYLAMINES, CYCLOALKYLAMINES, PIPERIDINE, ALKYLPIPERIDINES, MORPHOLINE, AND 5-METHYL-1,3-DIOXANYL-5AMINE AND RECOVERING FROM THE REACTION PRODUCT THE CORRESPONDING 3-SUBSTITUTED COMPOUND OF THE GENERAL FORMULA
Claim 4
Independent Claim
42 words
THE METHOD WHICH COMPRISES REACTING 2HYDROXY-1,4-NAPHTHOQUINONE WITH FORMALDEHYDE AND A NITROGEN-CONTAINING BASE SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL- AND DI-ALKYLAMINES, CYCLOALKYLAMINES, PIPERIDINE, ALKYLPIPERIDINES, MORPHOLINE, AND 5-METHYL-1,3-DIOXANYL-5AMINE AND RECOVERING FROM THE REACTION PRODUCT THE CORRESPONDING 3-SUBSTITUTED COMPOUND OF THE GENERAL FORMULA
References Cited (Backward Citations)
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US1824676A
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US2056046A
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US2260265A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |