Patent US3559236A successfully refreshed from Google Patents.
US3559236A
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Apparatus for molding plastic
Assignee: PROFORM INC A CORP OF MN
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Filing: 1969-12-02
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Granted: 1971-02-02
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Expires: 1989-12-02
Abstract
Abstract PLASTIC MOLDING APPARATUS OF AN AUTOCLAVE TYPE HAVING A HOT GAS OR STEAM DEFORMABLE INNER LINER WHICH CONFORMS TO A LIGHT-WEIGHT, TWO-PART MOLD CONTAINING CURABLE PLASTIC. THE INTRODUCTION OF STEAM CONFORMS THE LINER TO THE EXTERIOR OF THE MOLD AND PROVIDES HEAT AND PRESSURE TO CURE THE PLASTIC.
Inventors
- 👤 James A Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:46
CPC Classifications
E; E01; E01H; E01H1/00; E01H1/08; E01H1/0827; E01H1/0836; E01H1/0845; B; B29; B29C; B29C33/00
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |