US3764431A
Expired / Lapsed
US
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Method and apparatus for making channelled sheets from deformable materials
Assignee: Flachglas Wernberg GmbH
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Filing: 1970-10-22
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Granted: 1973-10-09
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Expires: 1990-10-22
Abstract
Abstract A method of making channelled sheets from deformable materials includes the steps of forming a laminate of webs with expandable shaping devices between the webs, and expanding the devices to urge outer webs against smooth surfaces and to urge a middle web or webs to adopt a channel wall configuration, with the edges of at least the outer webs being restrained against movement transverse to the channels. The outer webs can be preten- sioned, and the expandable shaping devices can be restrained during expansion and can also be pretensioned.
Inventors
- 👤 R Mueller
- 👤 L Thoma
- 👤 H Kraemer
- 👤 J Butz
- 👤 X Bernklau
- 👤 J Poellmann
- 👤 H Zielbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:33
CPC Classifications
B; B29; B29D; B29D24/00; B29D24/002; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/44; B29C70/446; B29C70/54; B29C70/56; B29C43/00; B29C43/02; B29C43/10; B29C43/12; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |