Patent US3736200A successfully refreshed from Google Patents.
US3736200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for vacuum molding book bindings
Assignee: Abildgaard Laboratories Inc
•
Filing: 1971-03-10
•
Granted: 1973-05-29
•
Expires: 1991-03-10
Abstract
Abstract The method involves softening thermoplastic book covers and spine caps by application of heat and simultaneously applying a vacuum on the inside of a flexible membrane so that atmospheric pressure forces the membrane against the converse and spine, molding the same together and joining the spine to the edges of the pages. By use of a prepared casting release paper, simulated grain my be embossed in the covers and various legends and ornamentation applied. The molding of the cover may laminated various layers of plastic of different thickness, colors, etc. The edges of the covers are rounded during molding. Panels or imbedded inserts may be formed in the covers or spine.
Inventors
- 👤 W Abildgaard
- 👤 C Groswith
- 👤 H Melgaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:08
CPC Classifications
B; B42; B42B; B42B5/00; B42B5/08; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |