US3793283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact-improved polypropylene compositions
Assignee: Shell USA Inc
•
Filing: 1972-03-16
•
Granted: 1974-02-19
•
Expires: 1992-03-16
Abstract
Abstract THE IMPACT RESISTANCE OF IMPACT-IMPROVED COMPOSITIONS OF POLYPROPYLENE MODIFIED WITH ADDED ETHYLENE-PROPYLENE LEASTOMERS OR WITH 1-20% BY WEIGHT OF APPROPRIATELY COPOLYMERIZED ETHYLENE IS FURTHER SUBSTANTIALLY IMPROVED BY THE PRESENCE OF CERTAIN BLOCK COPOLYMERS OF MONO-ALPHA-ALKENYL ARENES AND CONJUGATED DIENES. THE COMPOSITIONS ARE ESPECIALLY SUITABLE FOR FOAM STRUCTURES.
Inventors
- 👤 N Frailey
- 👤 R Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L23/00; C08L23/02; C08L23/10; C08L51/00; C08L51/06; C08L53/00; C08L53/02; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2453/00; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; C08L91/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |