Patent US3608016A successfully refreshed from Google Patents.
US3608016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming and producing preferably cup-shaped hollow bodies by drawing a material capable of being formed by heat
Assignee: Tetra Pak AB
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Filing: 1969-01-27
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Granted: 1971-09-21
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Expires: 1989-01-27
Abstract
Abstract Cup-shaped hollow bodies formed by clamping a sheet of thermoplastic material over a closed space having a mandrel therein and heating the sheet and then moving the mandrel against the heated sheet to deform same and form the hollow bodies. Provisions are made for making the walls of the body substantially uniform and for severing the hollow body from the unused sheet of material.
Inventors
- 👤 Sven Nils Hakan Holmstrom
- 👤 Jan-Erik Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:35
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/04; B29C51/06; B29C51/26; B29C51/30; B29C51/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
A method as claimed in claim 1, and further comprising the step of increasing the air pressure within the airtight space after the outward bulge has formed so as to inflate the sheet to a domed shape before moving the mandrel toward and against the plasticized sheet of material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |