US2824076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of odor-free cellular polyvinylchloride with dinitrosopentamethylenetetramine
Assignee: EIDP Inc
•
Filing: 1953-12-21
•
Granted: 1958-02-18
•
Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 Mack F Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/107; Y; Y10; Y10S; Y10S521/00; Y10S521/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS OF PREPARING A SUBSTANTIALLY COLORLESS, ODOR FREE, OPEN CELL POLYVINYLCHLORIDE SPONGE WHICH COMPRISES EXPANDING POLYVINYLCHLORIDE BY HEATING IN AN ENVIRONMENT WHICH IS MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 120* AND 170*C., AT ATMOSPHERIC PRESSURE WITH ABOUT 4 TO 8 PARTS OF DINITROSOPENTAMETHYLENETETRAMINE PER HUNDRED PARTS OF THE POLYVINYLCHLORIDE RESIN IN THE PRESENCE OF A SLIGHTLY ALKALINE ORGANIC MATERIAL FROM THE CLASS CONSISTING OF UREA AND TRIS-(HYDROCYMETHYL) AMINOMETHANE AND A WEAKLY IONIZED ACID FROM THE CLASS CONSISTING OF BORIC ACID AND CITRIC ACID, SAID SLIGHTLY ALKALINE ORGANIC MATERIAL BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT ONE PART BY WEIGHT PER PART OF DINITROSOPENTAMETHYLENETETRAMINE AND SAID WEAKLY IONIZED ACID BEING PRESENT IN AN AMOUNT OF FROM ABOUT 0.25 TO ABOUT 2.0 PARTS BY WEIGHT PER PART OF DINITROSOPENTAMETHYLENETETRAMINE.
Claim 2
Dependent Claim
130 words
A PROCESS OF PREPARING A SUBSTANTIALLY COLORLESS, ODOR FREE, OPEN CELL POLYVINYLCHLORIDE SPONGE WHICH COMPRISES EXPANDING POLYVINYLCHLORIDE BY HEATING IN AN ENVIRONMENT WHICH IS MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 120* AND 170*C., AT ATMOSPHERIC PRESSURE WITH ABOUT 4 TO 8 PARTS OF DINITROSOPENTAMETHYLENETETRAMINE PER HUNDRED PARTS OF THE POLYVINYLCHLORIDE RESIN IN THE PRESENCE OF A SLIGHTLY ALKALINE ORGANIC MATERIAL FROM THE CLASS CONSISTING OF UREA AND TRIS-(HYDROCYMETHYL) AMINOMETHANE AND A WEAKLY IONIZED ACID FROM THE CLASS CONSISTING OF BORIC ACID AND CITRIC ACID, SAID SLIGHTLY ALKALINE ORGANIC MATERIAL BEING PRESENT IN AN AMOUNT OF AT LEAST ABOUT ONE PART BY WEIGHT PER PART OF DINITROSOPENTAMETHYLENETETRAMINE AND SAID WEAKLY IONIZED ACID BEING PRESENT IN AN AMOUNT OF FROM ABOUT 0.25 TO ABOUT 2.0 PARTS BY WEIGHT PER PART OF DINITROSOPENTAMETHYLENETETRAMINE.
References Cited (Backward Citations)
US1090089A
Cited
US1912591A
Cited
US2250192A
Cited
US2491709A
Cited
US2444881A
Cited
US2570182A
Cited
US2754276A
Cited
US2666036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |