US4307471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective helmet
Assignee: DuPont Canada Inc
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Filing: 1978-06-29
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Granted: 1981-12-29
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Expires: 1998-06-29
Abstract
Abstract A helmet for the protection of sportsmen and/or workers in potentially hazardous occupations is disclosed. In one embodiment the helmet comprises a protective head shell and means to position the helmet on a users head in which the head shell has an outer section slidably connected to an inner section. The outer section is adapted to move relative to the inner section on impact with an object. In another embodiment the helmet further comprises a plurality of cushioning projections located between the two shells, each projection being integrally connected to one of the shells.
Inventors
- 👤 Peter J. Lovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:55
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/065; A42B3/063; A42B3/064; A42B3/10; A42B3/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A protective helmet comprising: (a) an outer shell; (b) cushioning means located on the inside of said outer shell, said cushioning means including an inner shell spaced apart from the outer shell and being adapted to move relative to the outer shell; (c) a plurality of projections located between the inner shell and the outer shell, each of said projections being integrally connected to a base selected from the group consisting of (1) the outer shell, (ii) the inner shell, and (iii) a base independent of said shells and which is located between said shells, said projections being elongated and substantially rigid and being adapted to flex when subjected to compressive force, the projections having free ends that contact or are juxtaposed to a shell.
Claim 2
Dependent Claim
125 words
A protective helmet comprising: (a) an outer shell; (b) cushioning means located on the inside of said outer shell, said cushioning means including an inner shell spaced apart from the outer shell and being adapted to move relative to the outer shell; (c) a plurality of projections located between the inner shell and the outer shell, each of said projections being integrally connected to a base selected from the group consisting of (1) the outer shell, (ii) the inner shell, and (iii) a base independent of said shells and which is located between said shells, said projections being elongated and substantially rigid and being adapted to flex when subjected to compressive force, the projections having free ends that contact or are juxtaposed to a shell.
Claim 3
Dependent Claim
51 words
A helmet of claim 1 wherein the inner and outer shells are of thermoplastic material independently selected from the group consisting of poly-α-olefins, polyamides, polycarbonate, acrylonitrile/butadiene/styrene polymers, polyvinyl chloride, cellulose acetobutyrate, polybutylene terephthalate, polyoxymethylene polymers and reinforced polyester polymers, said reinforced polymers being reinforced with glass with glass or aramid fibers.
Claim 4
Dependent Claim
60 words
A helmet of claim 2 in which the projections are integrally connected to a base selected from the group consisting of the outer shell and the inner shell and said outer shell and said inner shell and the projections thereon are each fabricated from polyethylene having a density of at least 0.950 and a melt index in the range 1-12.
Claim 5
Dependent Claim
73 words
A helmet of claim 2 in which the projections are integrally connected to the inner shell and said inner shell and the projections thereon are fabricated from a material selected from the group consisting of (a) polyethylene having a density of at least 0.950 and a melt index in the range 1-12 and (b) a blend of polyethylene of (a) with an ethylene/vinyl acetate copolymer having 15-20% by weight of vinyl acetate comonomer.
Claim 6
Dependent Claim
16 words
A helmet of claim 4 in which said melt index is in the range of 4-6.
Claim 7
Dependent Claim
16 words
A helmet of claim 1 in which the projections are integrally connected to the outer shell.
Claim 8
Dependent Claim
16 words
A helmet of claim 1 in which the projections are integrally connected to the inner shell.
Claim 9
Dependent Claim
26 words
A helmet of claim 1 in which the projections are integrally connected to a base independent of said shells and which is located between said shells.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |