US3587787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shear action energy absorption material
Assignee: Energy Absorption Systems Inc
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Filing: 1967-09-28
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Granted: 1971-06-28
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Expires: 1987-09-28
Abstract
Abstract AN ENERGY-ABSORBING MATERIAL COMPRISING A PAIR OF LATTICE CONSTRUCTIONS MADE OF SHEET MEMBERS OVERLYING EACH OTHER SUCH THAT THE EDGES OF THE SHEET MEMBERS ENGAGE EACH OTHER UPON IMPACT AND WHEN CRUSHED, CUT AND DISTORT EACH OTHER, THEREBY ABSORBING THE IMPACT ENERGY, AND A MEMBRANE FOR SEPARATING THE LATTICE CONSTRUCTION IS DISCLOSED
Inventors
- 👤 John W Rich
- 👤 Grant W Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/12; F16F7/127
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |