US3716434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal for plastic sheeting
Assignee: Tredegar Corp
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Filing: 1970-07-02
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Granted: 1973-02-13
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Expires: 1990-07-02
Abstract
Abstract An overlap seal for joining together two edges of reinforced thermoplastic material. A plurality of strands or bands of hot melt adhesive are applied adjacent the edge of the one sheet of thermoplastic reinforced material and the edge of another sheet is positioned above the first sheet. The sheets are brought together and pressure is applied so that the heat contained in the hot melt adhesive causes a fusion of the two edges of thermoplastic to create a high strength bond. Some of the bands of thermoplastic material flow together to form a wide band with narrower bands on each side to provide an overlapped seal having increased strength.
Inventors
- 👤 C Cook
- 👤 D Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
C; C09; C09J; C09J5/00; C09J5/10; B; B29; B29C; B29C65/00; B29C65/02; B29C65/40; B29C65/405; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/72; B29C66/721; B29C66/7214; B29C66/72141; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
A process for making an overlap seal between two edges of one or more sheets of filament reinforced plastic material comprising: a. aligning said two edges of plastic material in overlapping, spaced apart, parallel relationship; b. providing a plurality of molten strands of a hot melt adhesive, said adhesive having a melting point high enough so that sufficient heat is carried by said molten strands to bond effectively to the plastic sheets with the addition of pressure only; c. placing said plurality of molten strands of said adhesive between said overlapped edges, said plurality of molten strands of adhesive including at least two large central strands and one or more smaller strands on each side thereof; and d. applying pressure only to at least one of said edges to bond said edges together by means of a plurality of bands of said adhesive, one of said bands being produced by flowing together said central strands to form one band having a final width greater than the other bands.
Claim 2
Dependent Claim
168 words
A process for making an overlap seal between two edges of one or more sheets of filament reinforced plastic material comprising: a. aligning said two edges of plastic material in overlapping, spaced apart, parallel relationship; b. providing a plurality of molten strands of a hot melt adhesive, said adhesive having a melting point high enough so that sufficient heat is carried by said molten strands to bond effectively to the plastic sheets with the addition of pressure only; c. placing said plurality of molten strands of said adhesive between said overlapped edges, said plurality of molten strands of adhesive including at least two large central strands and one or more smaller strands on each side thereof; and d. applying pressure only to at least one of said edges to bond said edges together by means of a plurality of bands of said adhesive, one of said bands being produced by flowing together said central strands to form one band having a final width greater than the other bands.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein one or more of the bands adjacent each edge of the seal retains its individual integrity after the application of pressure to said edges.
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) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |