US3677873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded sheet material
Assignee: Individual
•
Filing: 1968-12-27
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Granted: 1972-07-18
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Expires: 1988-12-27
Abstract
Abstract AN EXTRUDED SHEET MATERIAL HAVING DISTRUPTED SURFACE LAYERS AND A CONTINOUS CORE COMPRISING THIN LAMELLAE LAYING ONE UPON THE OTHER FLAT OVERLAPPING SANDWICHLIKE ARRANGEMENT, SAID LAMELLAE BEING BONDED TOGETHER IN THE CORE ZONE AND BEING DISCONNECTED OR CONNECTED THROUGH DISTRUPTED CONNECTIONS IN THE SURFACE LAYERS. A METHOD OF EXTRUDING TWO EXTRUDABLE MATERIALS TO FORM A SHEET STRUCTURE CONSISTING OF ALTERNATING LAMELLAE OF SAID MATERIALS, ONE OF SAID MATERIALS BEING EXTRUDED ONLY IN THE SURFACE LAYERS, TRANSVERSLY SMEARING OUT SAID SHEET STRUCTURE AND SUBSEQUENTLY DISTRUPTING THE CONTINUOUS STRUCTURE OF THE SURFACE LAYERS.
Inventors
- 👤 Ole-Bendt Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/16; B29C48/18; B29C48/03; B29C48/09; B29C48/10; B29C48/07; B29C48/08; B29C48/19; B29C48/20; B29C48/22; B60; B60W; B60W2710/00; B60W2710/06; B60W2710/0644; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24471
Claims Analysis
Total Claims: 0
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |