Patent US3793422A successfully refreshed from Google Patents.
US3793422A
Expired / Lapsed
US
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Angled cut-off in bottom of blow mold
Assignee: Phillips Petroleum Co
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Filing: 1971-09-07
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Granted: 1974-02-19
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Expires: 1991-09-07
Abstract
Abstract MOLD PARTS ARE CLOSED ABOUT A PREFORMED PARISON PINCHING IT SHUT AT ONE END PREPARATORY TO BLOW MOLDING IT TO A HOLLOW ARTICLE. A CUT-OFF BLADE SLIDES WITHIN ONE MOLD PART AT AN ANGLE SO AS TO ENABLE IT TO SEVER THE PARISON AT A POINT ADJACENT THE SEAL LINE OF THE ARTICLE BEING FORMED. THIS ARRANGEMENT ALLOWS PINCHING SHUT PARISONS MADE OF CRYSTALLINE MATERIALS SUCH AS 1-OLEFIN POLYMERS, WHICH PARISONS HAVE BEEN HEATED TO A TEMPERATURE JUST BELOW THE CRYSTALLINE MELTING POINT, IN SUCH A MANNER THAT A GOOD SEAL IS OBTAINED WITH THE SEAL LINE BEING IN AN INDENTED PORTION OF THE BOTTOM; THUS THE BOTTLE WILL SIT FLAT ON A SURFACE.
Inventors
- 👤 R Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:55
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/14; B29C49/42; B29C49/48; B29C49/4802; B29C49/4817; B29C49/50
Claims Analysis
Total Claims: 0
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |