Patent DE663841C successfully refreshed from Google Patents.
US3570067A
Expired / Lapsed
US
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Apparatus for forming sheet material
Assignee: McDonnell Douglas Corp
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Filing: 1968-05-29
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Granted: 1971-03-16
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Expires: 1988-05-29
Abstract
Abstract UPRIGHT AIRTIGHT CHAMBER WITH OPEN UPPER END HOUSES VERTICALLY MOVING PLATEN CARRYING FORM BLOCK. FIRST DRAW RING MOUNTED ON RIM OF CHAMBER WITH APERTURE CORRESPONDING TO FORM BLOCK. SECOND DRAW RING WITH CORRESPONDING APERTURE ABOE FIRST RING AND MOVABLE UP AND DOWN TO LOAD AND SLIDABLY GRIP HEAT-SOFTENED SHEET OF THERMOPLASTIC MATERIAL BETWEEN RINGS. FORM BLOCK PASSES UP THROUGH APERTURES TO FLOW-FORM SHEET. PRESSURE AND VACUUM MEANS TO BLOW-FORM SHEET UP OR DOWN INTO DOME SHAPE BEFORE FORM BLOCK IS ACTUATED. WHEN FORM- ING IS VIRTUALLY COMPLETE, VACUUM MAY BE APPLIED INSTANTANEOUSLY TO SNAP SHEET BACK ON FORM BLOCK FOR ACCURATE SHAPING.
Inventors
- 👤 Robert M Jones
- 👤 Howard G Nourse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:00
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/08; B29C51/04; B29C51/06
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |