US3435018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isotactic polymers of styrene and pentene-1,and products made thereof
Assignee: Montedison SpA
•
Filing: 1958-05-05
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Granted: 1969-03-25
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Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 Giulio Natta
- 👤 Piero Pino
- 👤 Giorgio Mazzanti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:32
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/14; C08F32/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
AS A NEW PRODUCT, POLYSTYRENE CONSISTING ESSENTIALLY OF ISOTACTIC POLYSTYRENE MADE UP OF ISOTACTIC MACROMOLECULES HAVING, FOR SUBSTANTIALLY THE ENTIRE LENGTH OF THE MACROMOLECULAR MAIN CHAIN, THE TYPE OF STEREOREGULAR STRUCTURE ILLISTRATED IN THE MODEL OF A PORTION OF AN ISOTACTIC POLYSTYRENE MACROMOLECULE FULLY EXTENDED IN A PLANE, AS SHOWN IN FIGURE 2 OF THE ACCOMPANYING DRAWING SAID POLYSTYRENE HAVING A HIGH MOLECULAR WEIGHT, BEING CRYSTALLIZABLE AND HAVING, IN THE CRYSTALLINE STATE, THE FOLLOWING CHARACTERISITCS: A MELTING POINT OF ABOUT 230* C., A PERIOD OF IDENTITY IN THE RANGE 6.6-6.7 A., AND A DENSITY OF 1.08, AND BEING FURTHER CHARACTERIZED IN BEING INSOLUBLE IN BOILING N-HEPTANE.
Claim 2
Dependent Claim
106 words
AS A NEW PRODUCT, POLYSTYRENE CONSISTING ESSENTIALLY OF ISOTACTIC POLYSTYRENE MADE UP OF ISOTACTIC MACROMOLECULES HAVING, FOR SUBSTANTIALLY THE ENTIRE LENGTH OF THE MACROMOLECULAR MAIN CHAIN, THE TYPE OF STEREOREGULAR STRUCTURE ILLISTRATED IN THE MODEL OF A PORTION OF AN ISOTACTIC POLYSTYRENE MACROMOLECULE FULLY EXTENDED IN A PLANE, AS SHOWN IN FIGURE 2 OF THE ACCOMPANYING DRAWING SAID POLYSTYRENE HAVING A HIGH MOLECULAR WEIGHT, BEING CRYSTALLIZABLE AND HAVING, IN THE CRYSTALLINE STATE, THE FOLLOWING CHARACTERISITCS: A MELTING POINT OF ABOUT 230* C., A PERIOD OF IDENTITY IN THE RANGE 6.6-6.7 A., AND A DENSITY OF 1.08, AND BEING FURTHER CHARACTERIZED IN BEING INSOLUBLE IN BOILING N-HEPTANE.
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |