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US3663469A
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Particle-containing elastic polyurethane layer
Assignee: Wertex Anstalt
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Filing: 1969-10-17
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Granted: 1972-05-16
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Expires: 1989-10-17
Abstract
Abstract AN ELASTIC LAYER OF POLYURETHANE IS PREPARED BY BINDING GRANULATED ELASTIC MATERIAL WITH A LIQUID POLYURETHANE COMPOSITON WHICH CURES TO A RESILIENT SOLID PRODUCT. WHEN THE SPACES BETWEEN THE GRANULATED MATERIAL IS ONLY PARTIALLY FILLED WITH THE LIQUID, A POROUS ARTICLE RESULTS.
Inventors
- 👤 Joseph A Weissmahr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:38
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S264/00; Y10S264/07; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/25; Y10T428/29; Y10T428/31504; Y10T428/31551; Y10T428/31786
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |