US2849430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of volatile ingredients from thermoplastic polymers
Assignee: Dow Chemical Co
•
Filing: 1955-07-07
•
Granted: 1958-08-26
•
Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 James L Amos
- 👤 Arthur F Roche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:26
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/26; C08F6/28; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S159/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD FOR REMOVING, FROM NON-VOLATILE THERMOPLASTIC POLYMERS OF VINYLIDENE COMPOUNDS, VAPORIZABLE ORGANIC INGREDIENTS THAT ARE PRESENT AS IMPURITIES INCIDENT TO FORMATION OF THE POLYMERS FROM SUCH COMPOUNDS, WHICH METHOD COMPRISES HEATING THE POLYMER COMPOSITION CONTAINING SAID INGREDIENTS IN A VESSEL UNDER CONDITIONS OF TEMPERATURE AND PRESSURE SUCH AS TO VAPORIZE SAID INGREDIENTS, THE TEMPERATURE BEING OF A RANGE OF FROM ABOUT 200* TO ABOUT 270*C., THE PORTIONS OF SAID VESSEL THAT ARE THEREBY CONTACTED WITH THE VAPORIZED ORGANIC INGREDIENTS BEING COMPOSED OF A METAL COMPOSITION CONTAINING ALUMINUM AS THE PRINCIPAL INGREDIENT AND FREE OF METALS HIGHER THAN MAGNESIUM IN THE ELECTROMOTIVE SERIES, AND WITHDRAWING THE VAPORS FROM THE VESSEL.
Claim 2
Independent Claim
110 words
A METHOD FOR REMOVING, FROM NON-VOLATILE THERMOPLASTIC POLYMERS OF VINYLIDENE COMPOUNDS, VAPORIZABLE ORGANIC INGREDIENTS THAT ARE PRESENT AS IMPURITIES INCIDENT TO FORMATION OF THE POLYMERS FROM SUCH COMPOUNDS, WHICH METHOD COMPRISES HEATING THE POLYMER COMPOSITION CONTAINING SAID INGREDIENTS IN A VESSEL UNDER CONDITIONS OF TEMPERATURE AND PRESSURE SUCH AS TO VAPORIZE SAID INGREDIENTS, THE TEMPERATURE BEING OF A RANGE OF FROM ABOUT 200* TO ABOUT 270*C., THE PORTIONS OF SAID VESSEL THAT ARE THEREBY CONTACTED WITH THE VAPORIZED ORGANIC INGREDIENTS BEING COMPOSED OF A METAL COMPOSITION CONTAINING ALUMINUM AS THE PRINCIPAL INGREDIENT AND FREE OF METALS HIGHER THAN MAGNESIUM IN THE ELECTROMOTIVE SERIES, AND WITHDRAWING THE VAPORS FROM THE VESSEL.
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |