Patent US2590598A successfully refreshed from Google Patents.
US2590598A
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Polyethers and process of preparing the same
Assignee: GAF Chemicals Corp
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Filing: 1948-12-07
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Granted: 1952-03-25
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Expires: 1968-12-07
Abstract
No abstract record available.
Inventors
- 👤 John W Copenhaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:14
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/10; C07C41/00; C07C41/01; C07C41/18; C07C41/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
THE METHOD OF PRODUCING POLYETHERS BY THE REDUCTION OF POLYOXYACETALS OF THE FORMULA:
Claim 2
Independent Claim
13 words
THE METHOD OF PRODUCING POLYETHERS BY THE REDUCTION OF POLYOXYACETALS OF THE FORMULA:
Claim 3
Dependent Claim
4 words
COMPOUNDS OF THE FORMULA
Claim 4
Dependent Claim
4 words
COMPOUNDS OF THE FORMULA
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |