US5073444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded polypropylene foam tire cores
Assignee: Individual
•
Filing: 1990-01-11
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Granted: 1991-12-17
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Expires: 2010-01-11
Abstract
Abstract A molded polypropylene foam tire core suitable for all types of wheels. The core may be inserted, in one or more sections, into a pneumatic-type tire casing and mounted on a wheel rim to provide puncture-proof and rupture-proof internal support for said tire casing.
Inventors
- 👤 Dennis A. Shanelec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/232; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29D; B29D30/00; B29D30/02; B60; B60C; B60C7/00; B60C7/10; B60C7/101; B60C7/1015; B29C44/3415; B29C44/3426; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10279; Y10T152/10378; Y10T152/10387; Y10T152/10396; Y10T152/10432; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249971; Y10T428/249972
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A tire core for use in a vehicle tire casing, said tire core consisting of: at least (one) two arcuate segments, formed prior to insertion into said casing, of molded polypropylene foam beads fused together by steam and shrunk so that, when said segments are inserted in said casing, said segments will expand and be held in compression by said casing.
Claim 2
Dependent Claim
61 words
A tire core for use in a vehicle tire casing, said tire core consisting of: at least (one) two arcuate segments, formed prior to insertion into said casing, of molded polypropylene foam beads fused together by steam and shrunk so that, when said segments are inserted in said casing, said segments will expand and be held in compression by said casing.
Claim 3
Dependent Claim
40 words
The tire core of claim 1 wherein: said polypropylene foam beads are formed of polymers selected from the group consisting of: polypropylene homopolymer, ethylene-polypropylene random copolymer, ethylene-polypropylene-butene-1 random copolymer, polypropylene-ethylene block copolymer, silane-modified polypropylene, and crosslinked products of these polymers.
Claim 4
Dependent Claim
12 words
The tire core of claim 1 wherein: said steam was pressurized steam.
Claim 5
Dependent Claim
26 words
The tire core of claim 1 wherein: the fused polypropylene foam beads are composed of a polymer blend of the polymers set forth in claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |