US3616463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shock absorbing helmet
Assignee: MSA Safety Inc
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Filing: 1970-07-06
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Granted: 1971-11-02
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Expires: 1990-07-06
Abstract
Abstract A HELMET HAS SPACED INNER AND OUTER SHELLS OF RIGID MATERIAL FOR COVERING THE HEADS, AN OUTER LAYER OF ENERGY ABSORBING MATERIAL BETWEEN THE TWO SHELLS, AN INNER LAYER OF ENERGY ABSORBING MATERIAL ADJOINING THE INNER SURFACE OF THE INNER SHELL. ONE OF THE SHELLS AND THE ENERGY ABSORBING LAYER ADJOINING ITS INNER SURFACE ARE SUBDIVIDED INTO A PLURALITY OF ADJOINING SEGMENTS, WHEREBY AN IMPACT AGAINST THE HELMET WILL BE DISTRIBUTED THROUGHOUT THE AREA OF THE SHELL SEGMENT AND ENERGY ABSORBING SEGMENT RECEIVING THE IMPACT.
Inventors
- 👤 Michael Theodore
- 👤 James J Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:12
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/063; A42B3/10; A42B3/12; A42B3/125; A42B3/128
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |