US2597098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming hollow cellulose ester articles
Assignee: Acordis UK Ltd
•
Filing: 1950-03-29
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Granted: 1952-05-20
•
Expires: 1970-03-29
Abstract
No abstract record available.
Inventors
- 👤 Hawtin Philip Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
PROCESS FOR MAKING HOLLOW ARTICLES, WHICH COMPRISES SOFTENING A BLANK OF MATERIAL HAVING A BASIS OF AN ESTER OF CELLULOSE IN WHICH THE DEGREE OF SUBSTITUTION IS BETWEEN 2.25 AND 2.75 AND THE ESTER GROUPS OF WHICH CONTAIN 2 T 4 CARBON ATOMS BY SOAKING IN WATER CONTAINING A WETTING AGENT AND HEATING THE BLANK WHILE IT STILL CARRIES A FILM OF WATER ON ITS SURFACE AND STILL CONTAINS THE WATER ABSORBED DURING SOAKING, AND FORMING THE HOT, SOFTENED BLANK INTO THE DESIRED HOLLOW SHAPE BY THE APPLICATION OF FLUID PRESSURE.
Claim 2
Dependent Claim
91 words
PROCESS FOR MAKING HOLLOW ARTICLES, WHICH COMPRISES SOFTENING A BLANK OF MATERIAL HAVING A BASIS OF AN ESTER OF CELLULOSE IN WHICH THE DEGREE OF SUBSTITUTION IS BETWEEN 2.25 AND 2.75 AND THE ESTER GROUPS OF WHICH CONTAIN 2 T 4 CARBON ATOMS BY SOAKING IN WATER CONTAINING A WETTING AGENT AND HEATING THE BLANK WHILE IT STILL CARRIES A FILM OF WATER ON ITS SURFACE AND STILL CONTAINS THE WATER ABSORBED DURING SOAKING, AND FORMING THE HOT, SOFTENED BLANK INTO THE DESIRED HOLLOW SHAPE BY THE APPLICATION OF FLUID PRESSURE.
References Cited (Backward Citations)
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US1860687A
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US1998356A
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US2222461A
Cited
US2341673A
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US2262861A
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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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |