US3834932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming plastic sandwich structures
Assignee: Lonza AG
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Filing: 1971-08-05
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Granted: 1974-09-10
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Expires: 1991-08-05
Abstract
Abstract METHOD OF IMPROVING THE PROCESSABLILITY AND ADHESION CHARACTERISTICS OF FOAMED PLASTICS USED AS CORE MATERIAL FOR PLASTIC SANDWICH STRUCTURES, WHEREIN THE CORE OF FOAMED PLASTIC IS COATED WITH A COATING MATERIAL OF REINFORCED, UNSATURATED POLYESTER RESIN WHICH CONTAINS STYRENE AS CROSS-LINKING COMPONENT, A HARDENER AND AN ACCELERATOR. IN ACCORDANCE WITH THE INVENTION AND PRIOR TO APPLYING THE COATING MATERIAL TO THE CORE, AN ACCUMULATION OF ACCELERATOR IS PROVIDED IN THE CONTACT ZONE BETWEEN THE CORE AND THE COATING MATERIAL FOR PROMOTING COLD-HARDENING OF THE COATING MATERIAL. THE HARDENING OF THE COATING MATERIAL IS THE CONTACT ZONE IS THUS ACCELERATED.
Inventors
- 👤 K Brandl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:47
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/243; B; B32; B32B; B32B27/00; C08J9/00; C08J9/36; C08J9/365; C08J2367/00; C08J2367/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/249987; Y10T428/249991
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |