Patent US3709647A successfully refreshed from Google Patents.
US3709647A
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US
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Apparatus for forming an embossed thermoplastic sheet
Assignee: Clear Pack Co
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Filing: 1970-10-21
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Granted: 1973-01-09
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Expires: 1990-10-21
Abstract
Abstract An apparatus for vacuum forming an embossed design on a sheet of thermoplastic material. Softened thermoplastic material is formed into a sheet and extruded directly onto a vacuum-forming embossing roller, and subsequently removed from the roller. The core of the forming roller is hollow, with an annular space formed therein. A rod member is spirally wrapped around this annular space to form a spiral channel for passing a cooling medium through the forming roller.
Inventors
- 👤 C Barnhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:23
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/915; B29C48/9155; B29C48/001; B29C48/03; B29C48/07; B29C48/08; B29C48/914; B29C48/0017
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
An apparatus for producing an embossed thermoplastic film from molten thermoplastic material comprising: a forming roll comprising a cylindrical outer sleeve member having depressions on the outer surface thereof corresponding to a desired embossed pattern, and having apertures communicating with said depressions; a second cylindrical sleeve member disposed within said outer sleeve member and abutting the inner surface of said outer sleeve member; said second cylindrical member having channel means on the outer surface thereof forming vacuum passages between said outer sleeve member and said second sleeve member, said vacuum passages communicating with said apertures; means for rotating said forming roll; means for producing a vacuum in said vacuum passages; extrusion means located adjacent to said forming roll and being adapted to extrude a sheet of thermoplastic material directly onto said forming roll; and means for continuously removing said embossed sheet from said forming roll.
Claim 2
Independent Claim
145 words
An apparatus for producing an embossed thermoplastic film from molten thermoplastic material comprising: a forming roll comprising a cylindrical outer sleeve member having depressions on the outer surface thereof corresponding to a desired embossed pattern, and having apertures communicating with said depressions; a second cylindrical sleeve member disposed within said outer sleeve member and abutting the inner surface of said outer sleeve member; said second cylindrical member having channel means on the outer surface thereof forming vacuum passages between said outer sleeve member and said second sleeve member, said vacuum passages communicating with said apertures; means for rotating said forming roll; means for producing a vacuum in said vacuum passages; extrusion means located adjacent to said forming roll and being adapted to extrude a sheet of thermoplastic material directly onto said forming roll; and means for continuously removing said embossed sheet from said forming roll.
Claim 3
Dependent Claim
46 words
The apparatus as defined in claim 1 wherein said forming roll further comprises a third cylindrical member disposed within said second sleeve member; means defining a spiral-shaped channel between said second and third cylindrical members; and means for delivering a cooling medium to said spiral-shaped channel.
Claim 4
Dependent Claim
27 words
The apparatus as defined in claim 2 wherein said means defining a spiral-shaped channel comprises a rod-like member wrapped in spiral fashion around said third cylindrical member.
References Cited (Backward Citations)
US3027596A
Cited
US3085292A
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US3089191A
Cited
FR1435668A
Cited
US3416466A
Cited
US3515778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |