Patent US2561892A successfully refreshed from Google Patents.
US2561892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of ethyl cellulose
Assignee: Hercules Powder Co
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Filing: 1948-05-07
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Granted: 1951-07-24
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Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Peter Van Wyck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:14
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
AS A NEW COMPOSITION OF MATTER, AN ETHYL CELLULOSE CHARACTERIZED BY THE PRESENCE THEREIN OF AN AGENT CAPABLE OF STABILIZING THE ETHER AGAINST THE DEGRADING EFFECTS OF HEAT AND OXYGEN WITHOUT REDUCING THE VISCOSITY OF THE ESTER, SAID AGENT BEING AT LEAST ONE MATERIAL OF THE GROUP CONSISTING OF COPPER, BRASS AND BRONZE IN POWDERED FORM AND BEING PRESENT IN AN AMOUNT FROM ABOUT 0.0002% TO ABOUT 1%.
Claim 2
Dependent Claim
68 words
AS A NEW COMPOSITION OF MATTER, AN ETHYL CELLULOSE CHARACTERIZED BY THE PRESENCE THEREIN OF AN AGENT CAPABLE OF STABILIZING THE ETHER AGAINST THE DEGRADING EFFECTS OF HEAT AND OXYGEN WITHOUT REDUCING THE VISCOSITY OF THE ESTER, SAID AGENT BEING AT LEAST ONE MATERIAL OF THE GROUP CONSISTING OF COPPER, BRASS AND BRONZE IN POWDERED FORM AND BEING PRESENT IN AN AMOUNT FROM ABOUT 0.0002% TO ABOUT 1%.
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) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |