Patent US3784434A successfully refreshed from Google Patents.
US3784434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laminating packaging film
Assignee: BRH Corp
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Filing: 1971-03-08
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Granted: 1974-01-08
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Expires: 1991-03-08
Abstract
Abstract A multiple layer laminated packaging film incorporating cellophane coated on only one side with a heat sealable coating, heat sealable polyethylene applied to the uncoated side of the cellophane, and a polypropylene exterior layer joined to the coated side of the cellophane by means of a heat sealable coating on the inner surface of the polypropylene.
Inventors
- 👤 G Paisley
- 👤 F Tier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:54
CPC Classifications
B; B32; B32B; B32B27/00; B32B23/00; B32B23/04; B32B23/08; B32B27/32; B32B2323/00; B32B2323/04; B32B2323/10; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
providing a second layer consisting of a film of cellophane and a heat sealable saran polymer coating on only a first surface of the film, said coating being heat sealable within a temperature range of about 180*-250*F, and said cellophane having an uncoated second surface opposite the first surface;
Claim 2
Dependent Claim
75 words
joining the first layer to the second layer by placing the heat sealable coating of the first layer into contact with the heat sealable coating of the second layer and applying heat to the uncoated second surface of the cellophane to cause the heat sealable saran polymer coating of the first layer to fuse with the heat sealable saran polymer coating of the second layer to thereby laminate the first layer to the second layer;
Claim 3
Dependent Claim
36 words
moisturizing the cellophane by the application of water vapor through its uncoated second surface after the first layer has been joined to the second layer but before a third layer is joined to the second layer;
Claim 4
Dependent Claim
13 words
coating said second surface of the cellophane with an adhesion promoting primer, and
Claim 5
Dependent Claim
19 words
thereafter applying a third layer consisting of a heat sealable polyethylene over the entire second surface of the cellophane.
References Cited (Backward Citations)
US3037868A
Cited
US3445324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |