Patent US3567568A successfully refreshed from Google Patents.
US3567568A
Expired / Lapsed
US
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Impact resistant sheet and method for the preparation thereof
Assignee: Dow Chemical Co
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Filing: 1967-09-29
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Granted: 1971-03-02
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Expires: 1987-09-29
Abstract
Abstract BULLET PROOF SHEETS AND SHEETS HAVING HIGH IMPACT RESISTANCE ARE PREPARED BY FORMING A LAMINATE OF RESINGLASS FIBER LAYERS AND LAYERS OF AN OPEN-CELLED FLEXIBLE FOAM WITH AN ELASTOMER AND RETAINING THE OPEN-CELLED CONFIGURATION.
Inventors
- 👤 Leo J Windecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:00
CPC Classifications
F; F41; F41H; F41H5/00; F41H5/02; F41H5/04; F41H5/0471; F41H5/0478; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249994; Y10T442/00; Y10T442/30; Y10T442/3325; Y10T442/335
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |