Patent US3702789A successfully refreshed from Google Patents.
US3702789A
Expired / Lapsed
US
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Process for eliminating flashing from molded thermoplastic articles
Assignee: WR Grace and Co
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Filing: 1970-11-25
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Granted: 1972-11-14
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Expires: 1990-11-25
Abstract
Abstract FLASHING LEFT ON AN ARTICLE AFTER MOLDING IS ELIMINATED BY RAISING THE TEMPERATURE OF THE FLASHING UNTIL IT NO LONGER EXISTS. THERMOPLASTIC FLASHING IS HEATED UNTIL IT MELTS AND MERGES WITH THE GENERAL SURFACE OF THE ARTICLE. PREFERABLY A RIBBON HEATER IS POSITIONED CLOSELY ADJACENT TO THE FLASHING AND HEATED FOR A TIME SUFFICIENT TO MELT THE FLASHING, WHICH IS GENERALLY PAPER THIN, WITHOUT DAMAGING THE ADJACENT SURFACES OF THE ARTICLE.
Inventors
- 👤 Paul Dungan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:17
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/02
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |