US2688618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic caffeine derivatives
Assignee: Bristol Laboratories Inc
•
Filing: 1952-01-03
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Granted: 1954-09-07
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Expires: 1972-01-03
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Cooper
- 👤 Lee C Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:47
CPC Classifications
C; C07; C07D; C07D473/00; C07D473/02; C07D473/04; C07D473/06; C07D473/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
12 words
COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim
61 words
THE PROCESS OF REACTING AN ALKALI METAL DERIVATIVE OF AN ALCOHOL SUBSTITUTED IN THE BETA POSITION BY A BASIC RADICAL SELECTED FROM THE GROUP CONSISTING OF PIPERIDINO, PYRROLIDINO, MORPHOLINO AND DIALKYLAMINO RADICALS WHEREIN THE ALKYL RADICALS CONTAIN 1 TO 4 CARBON ATOMS WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF 8-BROMOCAFFEINE AND 8-CHLOROCAFFEINE TO FORM A BASIC ETHER OF CAFFEINE.
Claim 4
Dependent Claim
61 words
THE PROCESS OF REACTING AN ALKALI METAL DERIVATIVE OF AN ALCOHOL SUBSTITUTED IN THE BETA POSITION BY A BASIC RADICAL SELECTED FROM THE GROUP CONSISTING OF PIPERIDINO, PYRROLIDINO, MORPHOLINO AND DIALKYLAMINO RADICALS WHEREIN THE ALKYL RADICALS CONTAIN 1 TO 4 CARBON ATOMS WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF 8-BROMOCAFFEINE AND 8-CHLOROCAFFEINE TO FORM A BASIC ETHER OF CAFFEINE.
References Cited (Backward Citations)
DE586802C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |