US3014887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isotactic polystyrene compositions
Assignee: Shell USA Inc
•
Filing: 1957-06-07
•
Granted: 1961-12-26
•
Expires: 1977-06-07
Abstract
No abstract record available.
Inventors
- 👤 Haward Robert Nobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:38
CPC Classifications
C; C08; C08L; C08L21/00; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L25/00; C08L25/02; C08L25/04; C08L25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A POLYMER COMPOSITION COMPRISING A BLEND OF (1) AN ISOTACTIC POLYSTYRENE HAVING A SOFTENING POINT ABOVE 120*C. AND (2) A RUBBERY POLYMER OF BUTADIENE, THE AMOUNT OF THE RUBBERY POLYMER MAKING UP FROM 1% TO 25% BY WEIGHT OF THE COMBINED MIXTURE.
Claim 2
Dependent Claim
42 words
A POLYMER COMPOSITION COMPRISING A BLEND OF (1) AN ISOTACTIC POLYSTYRENE HAVING A SOFTENING POINT ABOVE 120*C. AND (2) A RUBBERY POLYMER OF BUTADIENE, THE AMOUNT OF THE RUBBERY POLYMER MAKING UP FROM 1% TO 25% BY WEIGHT OF THE COMBINED MIXTURE.
References Cited (Backward Citations)
US2282002A
Cited
US2574439A
Cited
US2643987A
Cited
US2439202A
Cited
US2578518A
Cited
US2655492A
Cited
US2805181A
Cited
US2797203A
Cited
US2844562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |