US3799837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluting and corrugated cardboard containing such fluting
Assignee: Billeruds AB
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Filing: 1971-05-07
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Granted: 1974-03-26
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Expires: 1991-05-07
Abstract
Abstract CORRUGATED CARDBOARD HAVING A HIGH RIGIDITY IN THE WET STATE CONTAINS A FLUTING WHICH CONSISTS OF A LAMINATED MATERIAL. SAID LAMINATED MATERIAL CONTAINS A CORE SHEET HAVING A WEIGHT OF 50-150 G./M.2 AND A MODULUS OF ELASTICITY OF AT LEAST 1000 N/MM.2. THE CORE SHEET CONSISTS OF A RIGID PLASTICS WHICH RETAINS ITS RIGIDITY IN THE WET STATE. THE CORE SHEET HAS ON BOTH SIDES PAPER COATINGS HAVING A WEIGHT OF 10-50 G./M.2.
Inventors
- 👤 O Witnes
- 👤 O Langaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:45
CPC Classifications
B; B32; B32B; B32B29/00; B32B29/08; B65; B65D; B65D65/00; B65D65/38; B65D65/40; B65D65/403; B32B27/00; B32B27/06; B32B27/10; B32B29/002; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2317/00; B32B2317/12; B32B2317/122; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/24711; Y10T428/24727; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |