US3616010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-barrier corrugated paperboard and its method of manufacture
Assignee: OI Glass Inc
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Filing: 1968-12-31
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Granted: 1971-10-26
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Expires: 1988-12-31
Abstract
Abstract A method of manufacturing a sheet of moisture-barrier, thermoplastic, laminated, corrugated paperboard which includes the lamination of a layer of thermoplastic-coated bag stock to either a linerboard or a medium layer prior to the medium layer being corrugated and affixed to the linerboard.
Inventors
- 👤 Harry E Dunholter
- 👤 James C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:00
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2804; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
173 words
An improved method of manufacturing wet strength corrugated paperboard including a medium layer having a thermoplastic film fused therewith which comprises the steps of: bringing a continuously advancing web of combined thermoplastic film and bag stock paper into face-to-face contact with a continuously advancing web of medium board; passing said joined webs over a heating element with said bag stock paper in contact with said heating element so that heat is applied through said bag stock paper to fuse said thermoplastic film with said bag stock paper and said medium board to completely laminate said bag stock paper to said medium board to form a laminated medium web of bag stock paper and medium board having an intermediate layer of thermoplastic film fused therebetween; corrugating said laminated mEdium web; 1 applying adhesive to said laminated medium web; bringing said adhesively coated, laminated medium web into contact with at least one continuously advancing web of linerboard; and bonding said adhesively coated, laminated medium web to said web of linerboard to form wet-strength corrugated paperboard.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |