US4484360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shin guard and method of making
Assignee: SPECTRUM SPORTS Inc A CORP OF OH
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Filing: 1983-10-13
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Granted: 1984-11-27
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Expires: 2003-10-13
Abstract
Abstract A shin guard and a method of making it are disclosed. The shin guard has a rigid outer shell of polyurethane and a polyurethane foam backing. A recess is formed in the foam backing by pressing in a hot die having the profile of the recess to be made. The recess is oblong and centered over the shin bone or tibia. A dense, modified polyurethane is then cast in the recess. The combination of polyurethane foam and dense, modified polyurethane provides excellent shock absorption in a light weight shin guard.
Inventors
- 👤 Kenneth B. Leighton
- 👤 Michael J. Silvestro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
A; A63; A63B; A63B71/00; A63B71/08; A63B71/12; A63B71/1225; A63B2071/1258
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
36 words
A shin guard comprising a rigid outer shell, a foam backing bonded to said shell, and a dense, modified polyurethane insert bonded to said backing, said insert being disposed between said backing and said rigid shell.
Claim 2
Dependent Claim
36 words
A shin guard comprising a rigid outer shell, a foam backing bonded to said shell, and a dense, modified polyurethane insert bonded to said backing, said insert being disposed between said backing and said rigid shell.
Claim 3
Dependent Claim
48 words
A shin guard comprising a rigid outer shell, a foam backing bonded to said shell, and a dense modified polyurethane insert bonded to said backing, said insert being received in a recess formed in said backing, said insert also being disposed between said backing and said outer shell.
Claim 4
Dependent Claim
48 words
A shin guard comprising a rigid outer shell, a foam backing bonded to said shell, and a dense modified polyurethane insert bonded to said backing, said insert being received in a recess formed in said backing, said insert also being disposed between said backing and said outer shell.
Claim 5
Dependent Claim
57 words
The shin guard of claim 2 wherein said insert includes a non-cellular polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, having a compression set less than 15%, an elongation break of at least 500%, a recovery after compression delayed by at least 7/10 of a second, and a hardness on the Shore scale not exceeding 70.
Claim 6
Dependent Claim
14 words
The shin guard of claim 3 wherein said compression set is less than 5%.
Claim 7
Dependent Claim
19 words
The shin guard of claim 3 having a hardness on the Shore 00 scale of between 20 and 70.
Claim 8
Independent Claim
38 words
A method of making a shin guard comprising the steps of forming a recess in a polyurethane foam backing, casting a dense, modified polyurethane foam in said recess, and adhering the resultant structure to a rigid outer shell.
Claim 9
Independent Claim
38 words
A method of making a shin guard comprising the steps of forming a recess in a polyurethane foam backing, casting a dense, modified polyurethane foam in said recess, and adhering the resultant structure to a rigid outer shell.
Claim 10
Dependent Claim
38 words
The method of claim 6 in which said step of forming a recess includes the step of pressing a hot die into the polyurethane foam backing, the hot die having the contour of the recess to be formed.
Claim 11
Dependent Claim
69 words
The method of claim 9 wherein said step of casting a dense, modified polyurethane includes the step of casting a flexible, non-cellular polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, having a compression set less than 15%, an elongation at break of at least 500%, a recovery after compression delayed by at least 7/10 of a second, and a hardness on the Shore 00 scale not exceeding 70.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |