Patent US4917219A successfully refreshed from Google Patents.
US4917219A
Expired / Lapsed
US
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Wheel chock
Assignee: Checkers Industrial Products LLC
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Filing: 1985-11-26
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Granted: 1990-04-17
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Expires: 2005-11-26
Abstract
Abstract A light-weight wheel chock is formed having a thin exterior shell of rigid, chemically-inert plastic material, such as high-density polyethylene, and an interior cavity filled with light-weight rigid or semi-rigid foam, such as high-density polyurethane foam.
Inventors
- 👤 Stephen K. Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:11
CPC Classifications
B; B60; B60T; B60T3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A wheel chock comprising: (a) an exterior shell of polyethylene comprising a base, a back surface, two side surfaces, and a ramp surface as the hypotenuse between the base and back surfaces; (b) a core of rigid foam of a secondary material; (c) a number of fill holes through the bottom surface of the exterior shell to allow introduction of a secondary material into the interior of the shell to form a core; and (d) a number of feet attached to the bottom surface of the exterior shell covering said fill holes.
Claim 2
Dependent Claim
92 words
A wheel chock comprising: (a) an exterior shell of polyethylene comprising a base, a back surface, two side surfaces, and a ramp surface as the hypotenuse between the base and back surfaces; (b) a core of rigid foam of a secondary material; (c) a number of fill holes through the bottom surface of the exterior shell to allow introduction of a secondary material into the interior of the shell to form a core; and (d) a number of feet attached to the bottom surface of the exterior shell covering said fill holes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |