Patent US2552807A successfully refreshed from Google Patents.
US3674399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making plastic book covers
Assignee: Bookwrights Inc
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Filing: 1970-08-13
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Granted: 1972-07-04
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Expires: 1990-08-13
Abstract
Abstract INDIVIDUALLY PLASTIC BOOK COVER ARE MOLDED IN NOVEL SHEET METAL MOLDS OF SIMPLE AND INEXPENSIVE CONSTRUCTION SHAPED TO CAST A BOOK COVER WITH STIFF FRONT AND BACK PANELS AND WITH A THIN PORTION FOR FLEXIBILITY WHERE THE FRONT AND BACK PANELS HAVE TO HINGE TO OPEN AND CLOSE THE BOOK. THE BOTTOMS OF THE MOLD CAVITIES MAY BE GIVEN CONTOURS FOR MOLDING DECORATIONS AND/OR LEGENDS, AS DESIRED, INTO THE OUTSIDE SURFACES OF THE COVERS. THE MOLDS ARE SHAPED TO STAY IN LINE A SUCCESSIVE MOLDS ARE PUSHED ALONG A GUIDE TRACK BY LUG ON AN ENDLESS CHAIN, AND THERE ARE AUTOMATIC CONTROLS FOR STOPPING AND STARTING THE FLOW OF PLASTIC AT A MOLD FILLING STATION.
Inventors
- 👤 Mortimer S Sendor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:11
CPC Classifications
B; B42; B42C; B42C7/00; B29; B29C; B29C39/00
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |