US3682736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the continuous manufacture of corrugated cardboards of synthetic resin
Assignee: Mitsubishi Chemical Corp
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Filing: 1969-07-09
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Granted: 1972-08-08
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Expires: 1989-07-09
Abstract
Abstract IN MANUFACTURING A CORRUGATED CARBOARD OF SYNTHETIC RESIN, A SHEET OF THERMOPLASTIC RESIN IS EXTRUDED AT A HIGH TEMPERATURE AND CORRUGATED BY MEANS OF A PAIR OF CORRUGATING ROLLS MAINTAINED AT A TEMPERATURE LOWER THAN THE EXTRUDED SHEET AND THEN A SECOND SHEET SIMILARLY EXTRUDED IS BONDED TO THE CORRUGATED SHEET AS A HIGH TEMPERATURE. AFTER COOLING THE SINGLE FACED CORRUGATED CARDBOARD ANOTHER EXTRUDED SHEET OF THERMOPLASTIC RESIN MAY BE BONDED TO THE OPPOSITE SIDE OF THE CORRUGATED SHEET TO FORM A DOUBLE FACED CORRUGATED CARDBOARD.
Inventors
- 👤 Susumu Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:32
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/30; B29C43/305; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/438; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B32; B32B; B32B27/00; B29C53/00; B29C53/22; B29C53/24; B29C53/28; B29C53/285; B29C66/71; B29C66/72; B29C66/727; B32B37/00; B32B37/14; B32B37/15; B32B37/153; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |