US2579755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing an ethyl cellulose hot-melt composition
Assignee: Hercules Powder Co
•
Filing: 1947-12-24
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Granted: 1951-12-25
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Expires: 1967-12-24
Abstract
No abstract record available.
Inventors
- 👤 George H Pyle
- 👤 John S Tinsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:16
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08; C09D101/26; C09D101/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN THE PROCESS FOR PRODUCING A THERMOPLASTIC ETHYL CELLULOSE HOT-MELT COMPOSITION BY HEATING TO ELEVATED TEMPERATURE TO COMPOUND THE COMPOSITION BY MELTING WHEREBY COLOR DEGRADATION IS CAUSED DURING THE COMPOUNDING, THE STEPS TO IMPROVE COLOR WHICH CONSIST IN ADDING TO THE COMPOSITION PRIOR TO COMPOUNDING BY MELTING FROM ABOUT 1% TO ABOUT 10%, BASED ON THE ETHYL CELLULOSE, OF A LOWER DIALKYL ESTER OF OXALIC ACID CONTAINING LESS THAN 6 CARBON ATOMS IN THE ALKYL GROUPS, AND THEREAFTER COMPOUNDING THE COMPOSITION IN THE PRESENCE OF SAID LOWER DIALKYL ESTER OF OXALIC ACID BY MELTING AND MIXING AT AN ELEVATED TEMPERATURE BETWEEN ABOUT 135* C. AND ABOUT 200* C. TO OBTAIN A FLUID HOT-MELT COMPOSITION RESISTANT TO COLOR DEGRADATION BY HEAT.
Claim 2
Dependent Claim
120 words
IN THE PROCESS FOR PRODUCING A THERMOPLASTIC ETHYL CELLULOSE HOT-MELT COMPOSITION BY HEATING TO ELEVATED TEMPERATURE TO COMPOUND THE COMPOSITION BY MELTING WHEREBY COLOR DEGRADATION IS CAUSED DURING THE COMPOUNDING, THE STEPS TO IMPROVE COLOR WHICH CONSIST IN ADDING TO THE COMPOSITION PRIOR TO COMPOUNDING BY MELTING FROM ABOUT 1% TO ABOUT 10%, BASED ON THE ETHYL CELLULOSE, OF A LOWER DIALKYL ESTER OF OXALIC ACID CONTAINING LESS THAN 6 CARBON ATOMS IN THE ALKYL GROUPS, AND THEREAFTER COMPOUNDING THE COMPOSITION IN THE PRESENCE OF SAID LOWER DIALKYL ESTER OF OXALIC ACID BY MELTING AND MIXING AT AN ELEVATED TEMPERATURE BETWEEN ABOUT 135* C. AND ABOUT 200* C. TO OBTAIN A FLUID HOT-MELT COMPOSITION RESISTANT TO COLOR DEGRADATION BY HEAT.
References Cited (Backward Citations)
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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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |