Patent US3728799A successfully refreshed from Google Patents.
US3728799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing thermoplastic sheet articles
Assignee: OSBOE O KONSTR RAZVITIJU MEKHA
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Filing: 1971-04-08
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Granted: 1973-04-24
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Expires: 1991-04-08
Abstract
Abstract A machine for making articles from sheet thermoplastic material which is characterized by a group of openings provided in the smooth surface of the machine table and communicating with a source of hot gas fed under pressure to define a gas cushion supporting the blank above the table surface and assisting in the heating of the blank.
Inventors
- 👤 K Streltsov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:51
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/42; B29C51/421; B29C51/424; B29B; B29B13/00; B29B13/02; B29B13/023; B29C35/00; B29C35/02; B29C35/04; B29C35/045
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
179 words
A machine for making articles from sheet thermoplastic material comprising feeding and heating means, said feeding and heating means being in communication, a table having first and second portions located in the feeding and heating means when the table is in its initial position, means mounting the table for reciprocating movement relative to and between said feeding and heating means and a position adapted to supply a shaping means, said table having a smooth surface for receiving a blank of thermoplastic material on the first portion thereof when the table is in its initial position, said smooth surface being provided with groups of openings throughout said first and second portions, means for feeding hot gas under pressure to the groups of openings to provide a gas cushion supporting the blanks above the smooth surface which assists in a uniform heating throughout the cross-section of the blank when the blank is in the heating means and facilitates the removal of the heated blank from the table when the table has moved to a position adapted to supply a shaping means.
Claim 2
Dependent Claim
179 words
A machine for making articles from sheet thermoplastic material comprising feeding and heating means, said feeding and heating means being in communication, a table having first and second portions located in the feeding and heating means when the table is in its initial position, means mounting the table for reciprocating movement relative to and between said feeding and heating means and a position adapted to supply a shaping means, said table having a smooth surface for receiving a blank of thermoplastic material on the first portion thereof when the table is in its initial position, said smooth surface being provided with groups of openings throughout said first and second portions, means for feeding hot gas under pressure to the groups of openings to provide a gas cushion supporting the blanks above the smooth surface which assists in a uniform heating throughout the cross-section of the blank when the blank is in the heating means and facilitates the removal of the heated blank from the table when the table has moved to a position adapted to supply a shaping means.
Claim 3
Dependent Claim
32 words
The machine as claimed in claim 1, in which the table is defined by a bottom wall, side walls, and said smooth surface constituting the top wall thereby providing a hollow body.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |