US3563837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing mat
Assignee: Day International Corp
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Filing: 1968-08-21
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Granted: 1971-02-16
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Expires: 1988-08-21
Abstract
Abstract A SHOCK-ABSORBING MAT IN WHICH A COVER IS FILLED WITH A MIXTURE OF SMALL PIECES OF FLEXIBLE ELASTOMERIC FOAM MATERIAL, SUCH AS LATEX OR URETHANE, AND SEMI-RIGID PLASTIC FOAM MATERIAL, SUCH AS EXPANDED STYRENE OR URETHANE.
Inventors
- 👤 Howard S Smith
- 👤 Leland E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
A; A63; A63B; A63B6/00; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/24; Y10T428/24479; Y10T428/24496
Claims Analysis
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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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |