Patent US5536250A successfully refreshed from Google Patents.
US3036340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding high molecular weight polyethylene
Assignee: Dayton Rubber Co
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Filing: 1960-04-04
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Granted: 1962-05-29
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Russell B Waddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:07
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0001; Y; Y10; Y10S; Y10S264/00; Y10S264/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD FOR MOLDING A HIGH DENSITY, HIGH MOLECULAR WEIGHT POLYETHYLENE POWDER COMPRISING ADMIXING A STABILIZER WITH SAID POWDER, COMPRESSING THE MIXTURE INTO A PRE-FORM, INSERTING SAID PRE-FORM INTO AN INJECTION POT AND HEATING TO A TEMPERATURE OF 485*F., SIMULTANEOUSLY HEATING A MOLD CAVITY TO A TEMPERATURE OF AT LEAST 260* F., APPLYING A PRESSURE OF AT LEAST 8,000 POUNDS PER SQUARE INCH UPON THE PRE-FORM WITHIN THE INJECTION POT CAUSING IT TO MOVE INTO SAID MOLD CAVITY AND MAINTAINING SAID PRESSURE AND THE TEMPERATURE OF SAID MOLD CAVITY FOR A PERIOD OF APPROXIMATELY SIXTEEN MINUTES AFTER SAID CAVITY HAS BEEN COMPLETELY FILLED WITH SAID PRE-FORM.
Claim 2
Independent Claim
106 words
A METHOD FOR MOLDING A HIGH DENSITY, HIGH MOLECULAR WEIGHT POLYETHYLENE POWDER COMPRISING ADMIXING A STABILIZER WITH SAID POWDER, COMPRESSING THE MIXTURE INTO A PRE-FORM, INSERTING SAID PRE-FORM INTO AN INJECTION POT AND HEATING TO A TEMPERATURE OF 485*F., SIMULTANEOUSLY HEATING A MOLD CAVITY TO A TEMPERATURE OF AT LEAST 260* F., APPLYING A PRESSURE OF AT LEAST 8,000 POUNDS PER SQUARE INCH UPON THE PRE-FORM WITHIN THE INJECTION POT CAUSING IT TO MOVE INTO SAID MOLD CAVITY AND MAINTAINING SAID PRESSURE AND THE TEMPERATURE OF SAID MOLD CAVITY FOR A PERIOD OF APPROXIMATELY SIXTEEN MINUTES AFTER SAID CAVITY HAS BEEN COMPLETELY FILLED WITH SAID PRE-FORM.
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) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |