US3659772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water resistant corrugated articles having improved fold flexibility
Assignee: Union Oil Company of California
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Filing: 1970-06-05
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Granted: 1972-05-02
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Expires: 1990-06-05
Abstract
Abstract A method for forming a flexible fold in corrugated paperboard rendered water resistant by impregnation with a solidifiable water proofing agent that imparts rigidity to the paperboard in which the fold is first treated with a non-rigid polymer pretreating agent prior to impregnation and a water resistant corrugated article having folds rendered flexible by this method. The method is particularly useful in manufacturing water resistant corrugated paperboard boxes having improved fold flexibility.
Inventors
- 👤 William Smith Dorsey
- 👤 Thomas Hallis Jr
- 👤 Edward A Pullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:06
CPC Classifications
B; B65; B65D; B65D5/00; B65D5/42; B65D5/4266; B31; B31B; B31B50/00; B31B50/74; B31B50/742; B31B50/743; Y; Y10; Y10S; Y10S229/00; Y10S229/93; Y10S229/939; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
The article defined in claim 1 wherein said water proofing agent is wax and/or a wax-polymer composition.
Claim 2
Dependent Claim
18 words
The article defined in claim 1 wherein score lines are formed on said corrugated paperboard at said folds.
Claim 3
Dependent Claim
16 words
The article defined in claim 1 wherein said polymer pretreating agent is polyolefin, polyterpene or polystyrene.
Claim 4
Dependent Claim
13 words
The article defined in claim 1 wherein said polymer pretreating agent is polyisobutylene.
Claim 5
Dependent Claim
13 words
The article defined in claim 1 wherein said polymer pretreating agent is polybutylene.
Claim 6
Dependent Claim
99 words
In a corrugated paperboard box rendered water resistant by impregnation with wax and wax-polymer compositions that impart increased rigidity to the paperboard, the improvement which comprises flexible folds in said paperboard along which said paperboard is folded during the assembly and use of the box, said folds being rendered flexible by scoring the paperboard along a desired fold line and treating the paperboard in a confined area along the fold prior to impregnation with said wax and wax-polymer compositions with a polymer pretreating agent that penetrates into the paperboard selected from the group consisting of polyolefins, polyterpenes and polystyrenes.
Claim 7
Dependent Claim
103 words
In a water resistant corrugated paperboard box of the type comprising a single sheet of corrugated paperboard cut to obtain a unitary member consisting of side and end panel sections having integrally formed top and bottom enclosing flaps and impregnated with a solidifiable waterproofing material selected from the group consisting of wax and wax-polymer compositions, the improvement which comprises top flap folds treated in a confined area along the folds prior to impregnation with said wax and wax-polymer compositions with a polymer pretreating agent that penetrates into said paperboard, said pretreating agent being selected from the group consisting of polyolefin, polyterpene and polystyrene.
Claim 8
Dependent Claim
25 words
The article defined in claim 8 including bottom flap folds treated in a confined area along the folds with said pretreating agent prior to impregnation.
Claim 9
Dependent Claim
30 words
The article defined in claim 8 including panel folds between said side and end panels treated in a confined area along the folds with said pretreating agent prior to impregnation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |