Patent US2840138A successfully refreshed from Google Patents.
US2840138A
Expired / Lapsed
US
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Wiltproofing paper and method of corrugating
Assignee: Inland Container Corp
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Filing: 1955-01-27
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Granted: 1958-06-24
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Expires: 1975-01-27
Abstract
No abstract record available.
Inventors
- 👤 Herbert N Johnston
- 👤 Benson G Brand
- 👤 Jr Willis B Lincoln
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/62; D21J; D21J1/00; D21J1/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
IN A METHOD OF MAKING CORRUGATING MATERIAL FOR CORRUGATED FIBREBOARD CONSTRUCTION, THE STEP OF IMPARTING WILT-RESISTANT PROPERTIES TO SAID CORRUGATING MATERIAL COMPRISING IMPREGNATING PAPER WITH MOLTEN PLASTICIZED RESIN, SAID PLASTICIZED RESIN COMPRISING FROM ABOUT 30 TO 90 PERCENT OF SUBSTANTIALLY PETROLEUM HYDROCARBON INSOLUBLE PINE WOOD RESIN AND THE BALANCE AT LEAST ONE FATTY ACID HAVING FROM 8 TO 18 CARBON ATOMS AS A PLASTICIZER, AND CORRUGATING THE IMPREGNATED PAPER.
References Cited (Backward Citations)
FR761456A
Cited
US2114392A
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US2114393A
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US2274792A
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US2385793A
Cited
US2357124A
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US2568349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |