US3687767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scoring process for certain rigid-when-wet corrugated fiberboard
Assignee: Alton Box Board Co
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Filing: 1971-02-25
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Granted: 1972-08-29
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Expires: 1991-02-25
Abstract
Abstract A PROCESS FOR MAXIMIZING CRACK RESISTANCE IN SOCRE LINES OF RIGID-WHEN-WET CORRUGATED FIBERBOARD MADE USING MEDIUM AND/OR LINER MEMBERS PRETREATED WITH A RESOLE PHENOLIC RESIN SYSTEM WHICH HAS BEEN MODIFIED WITH UREA AND INORGANIC AMMONIUM SALT AND WHICH PREFERABLY CONTAINS AN ORGANO SILYL COMPOUND. THE PROCESS INVOLVES FORMING THE CORRUGATED FIBERBOARD USING SUCH RESIN PRETREATED MEMBERS UNDER CERTAIN CONTROLLED TEMPERATURE CONDITIONS, SCORING THE SO-PRODUCED CORRUGATED FIBERBOARD, AND THEN HEATING THE SO-SCORED CORRUGATED FIBERBOARD TO THERMOSET THE PRETREATING RESIN SYSTEM.
Inventors
- 👤 Abraham J Reisman
- 👤 Thomas B Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:53
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; Y10T156/1007; Y10T156/1016; Y10T156/102; Y10T156/1025; Y10T156/1026
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |