Patent US1902496A successfully refreshed from Google Patents.
US3709967A
Expired / Lapsed
US
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Thermoforming oriented hollow articles from two sheets
Assignee: Phillips Petroleum Co
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Filing: 1970-11-18
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Granted: 1973-01-09
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Expires: 1990-11-18
Abstract
Abstract HOLLOW ARTICLES ARE FABRICATED FROM TWO FLAT SHEETS BY PASSING SAID SHEETS THROUGH A HEATING ZONE TO HEAT SAME TO ORIENTATION TEMPERATURE, AND THENCE ADVANCING SAID SHEETS BETWEN TWO MOLD HALVES. THE MOLD HALVES ARE THEN BROUGHT TOGETHER AND DIFFERNTIAL FLUID PRESSURE CAUSES THE SHEETS TO CONFORM TO THE SHAPE OF THE RESPECTIVE MOLD HALVES, THE SHEETS BEING SEALED AROUND THE PERIPHERAL EDGES OF THE MOLD.
Inventors
- 👤 E Held
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/06905; B29C49/0691
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |