Patent US3298975A successfully refreshed from Google Patents.
US3298975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable partially-foamed and cured polypropylene composition
Assignee: Hercules LLC
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Filing: 1966-03-18
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Granted: 1967-01-17
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Expires: 1986-03-18
Abstract
No abstract record available.
Inventors
- 👤 George B Feild
- 👤 Paul L Johnstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0033; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
AS A NEW COMPOSITION OF MATTER, AN EXPANDABLE COMPOSITION COMPRISING A PARTIALLY CROSS-LINKED AND EXPANDED BLEND OF STEREOREGULAR POLYPROPYLENE, A BLOWING AGENT WHICH YIELDS AT LEAST ONE MOLE OF GAS PER MOLE OF BLOWING AGENT AT A TEMPERATURE WITHIN THE RANGE OF SOFTENING TEMPERATURE OF SAID COMPOSITION TO ABOUT 190*C., AND FROM ABOUT 0.01% TO ABOUT 2%, BASED ON THE WEIGHT OF POLYPROPYLENE, OF A POLY(SULFONAZIDE) AS THE CROSSLINKING AGENT, SAID BLEND HAVING BEEN PARTIALLY CROSSLINKED AND EXPANDED TO FROM ABOUT 5% TO ABOUT 75% OF THE POTENTIAL EXPANSION OF THE BLEND.
Claim 2
Dependent Claim
92 words
AS A NEW COMPOSITION OF MATTER, AN EXPANDABLE COMPOSITION COMPRISING A PARTIALLY CROSS-LINKED AND EXPANDED BLEND OF STEREOREGULAR POLYPROPYLENE, A BLOWING AGENT WHICH YIELDS AT LEAST ONE MOLE OF GAS PER MOLE OF BLOWING AGENT AT A TEMPERATURE WITHIN THE RANGE OF SOFTENING TEMPERATURE OF SAID COMPOSITION TO ABOUT 190*C., AND FROM ABOUT 0.01% TO ABOUT 2%, BASED ON THE WEIGHT OF POLYPROPYLENE, OF A POLY(SULFONAZIDE) AS THE CROSSLINKING AGENT, SAID BLEND HAVING BEEN PARTIALLY CROSSLINKED AND EXPANDED TO FROM ABOUT 5% TO ABOUT 75% OF THE POTENTIAL EXPANSION OF THE BLEND.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |