Patent US4124904A successfully refreshed from Google Patents.
US4124904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective head gear
Assignee: Individual
•
Filing: 1977-10-17
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Granted: 1978-11-14
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Expires: 1997-10-17
Abstract
Abstract A helmet or the like which has a rigid central shell and inner and outer inflatable impact absorbing liners with one-way valve means for inflating same. A plurality of inserts of foam or spongy material is secured to the inner shell and adapted to contact the head of the wearer. The liners may be removably secured to the shell.
Inventors
- 👤 John A. Matthes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:51
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/063; A42B3/10; A42B3/12; A42B3/121; A42B3/122
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
In a protective helmet, a rigid shell adapted to fit over a human head, an outer inflatable liner secured over substantially the entire outer surface of said shell; and an inner inflatable liner secured over substantailly the entire inner surface of said shell and a plurality of spaced foamed sponge-like inserts attached to the inner surface of said inner liner, in which each said liner is fitted with independent check valve inlet means so that each liner may be independently inflated, and maintained in the inflated condition, independently of the other liner.
Claim 2
Dependent Claim
92 words
In a protective helmet, a rigid shell adapted to fit over a human head, an outer inflatable liner secured over substantially the entire outer surface of said shell; and an inner inflatable liner secured over substantailly the entire inner surface of said shell and a plurality of spaced foamed sponge-like inserts attached to the inner surface of said inner liner, in which each said liner is fitted with independent check valve inlet means so that each liner may be independently inflated, and maintained in the inflated condition, independently of the other liner.
Claim 3
Dependent Claim
16 words
The invention as recited in claim 1, wherein said liners are permanently secured to said shell.
Claim 4
Dependent Claim
25 words
The invention as recited in claim 1, including a plurality of sealed snaps passing through said liners for removably securing said liners to said shell.
Claim 5
Dependent Claim
24 words
The invention as recited in claim 1, together with a flexible porous cover fitted with means to detachably fasten over the outer inflatable liner.
Claim 6
Dependent Claim
22 words
The invention as recited in claim 1, wherein each said liner is inflated to a partial air capacity of the respective liner.
Claim 7
Dependent Claim
23 words
The invention as recited in claim 5, wherein each said liner is inflated within the range of one-half to two-thirds of its capacity.
References Cited (Backward Citations)
US3462763A
Cited
US3806950A
Cited
US3787893A
Cited
US3873997A
Cited
US3925821A
Cited
US3999220A
Cited
US4024586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |