US3213043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of foaming oxidized polyethylene
Assignee: WR Grace and Co
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Filing: 1963-08-29
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Granted: 1965-10-19
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Expires: 1983-08-29
Abstract
No abstract record available.
Inventors
- 👤 Clifton L Kehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
THE METHOD OF FOAMING OXIDIZED POLYETHYLENE COMPRISING HEATING SAID OXIDIZED POLYETHYLENE TO A TEMPERATURE OF AT LEAST 160*C. UNDER A PRESSURE IN EXCESS OF 50 POUNDS PER SQUARE INCH, THEN RELEASING THE PRESSURE TO SUBSTANTIALLY ATMOSPHERIC PRESSURE, WHEREBY THE OXIDIZED POLYETHYLENE FOAMS AND EXPANDS, AND FINALLY COOLING THIS EXPANDED FOAMED POLYETHYLENE.
Claim 2
Independent Claim
51 words
THE METHOD OF FOAMING OXIDIZED POLYETHYLENE COMPRISING HEATING SAID OXIDIZED POLYETHYLENE TO A TEMPERATURE OF AT LEAST 160*C. UNDER A PRESSURE IN EXCESS OF 50 POUNDS PER SQUARE INCH, THEN RELEASING THE PRESSURE TO SUBSTANTIALLY ATMOSPHERIC PRESSURE, WHEREBY THE OXIDIZED POLYETHYLENE FOAMS AND EXPANDS, AND FINALLY COOLING THIS EXPANDED FOAMED POLYETHYLENE.
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) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |