US2544899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making cyclic ethers
Assignee: Eastman Kodak Co
•
Filing: 1949-06-01
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Granted: 1951-03-13
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Expires: 1969-06-01
Abstract
No abstract record available.
Inventors
- 👤 Delbert D Reynolds
- 👤 William O Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:27
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08; C07D309/00; C07D309/02; C07D309/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
A PROCESS FOR PREPARING CYCLIC ETHERS COM-PRISING HEATING TOGETHER AN ALIPHATIC GLYCOL CONTAINING THE GROUP
Claim 2
Dependent Claim
15 words
A PROCESS FOR PREPARING CYCLIC ETHERS COM-PRISING HEATING TOGETHER AN ALIPHATIC GLYCOL CONTAINING THE GROUP
Claim 3
Dependent Claim
12 words
AND A SULFONYL HALIDE SELECTED FROM THOSE REPRESENTED BY THE GENERAL FORMULA:
Claim 4
Dependent Claim
12 words
AND A SULFONYL HALIDE SELECTED FROM THOSE REPRESENTED BY THE GENERAL FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |