US2581443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n-substituted nitrogen heterocyclic bases
Assignee: Eastman Kodak Co
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Filing: 1949-08-15
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Granted: 1952-01-08
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Expires: 1969-08-15
Abstract
No abstract record available.
Inventors
- 👤 Delbert D Reynolds
- 👤 William O Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:16
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A PROCESS FOR PREPARING AN N-SUBSTITUTED NITROGEN HETEROCYCLIC BASE SELECTED FROM THE GROUP CONSISTING OF AN N-SUBSTITUTED PIPERIDINE, AN N-SUBSTITUTED PYRROLIDINE, AND AN N-SUBSTITUTED MORPHOLINE, WHICH COMPRISES CONDENSING A DISULFONATE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
37 words
A PROCESS FOR PREPARING AN N-SUBSTITUTED NITROGEN HETEROCYCLIC BASE SELECTED FROM THE GROUP CONSISTING OF AN N-SUBSTITUTED PIPERIDINE, AN N-SUBSTITUTED PYRROLIDINE, AND AN N-SUBSTITUTED MORPHOLINE, WHICH COMPRISES CONDENSING A DISULFONATE COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
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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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |