Patent US4484361A successfully refreshed from Google Patents.
US4484361A
Expired / Lapsed
US
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Knee and elbow pad and method of making
Assignee: SPECTRUM SPOTS Inc 2069 MIDWAY DRIVE TWINSBURG OH 44087 AN OH CORP
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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 An elbow or knee pad and a method of making the same are disclosed. The pad includes an elasticized sleeve to surround the joint to be protected and a pad assembly fastened to the sleeve. The pad assembly includes a fabric covering over a polyurethane foam backing. A recess is formed in the polyurethane by pressing a hot die into it and a dense, modified polyurethane is cast in the recess. The combination of polyurethane foam and dense, modified polyurethane provides superior shock absorption and protection from impact.
Inventors
- 👤 Kenneth B. Leighton
- 👤 Michael J. Silvestro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:23
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/06; A41D13/065; A41D13/08; A41D13/055; A41D13/0556; A41D13/0568
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 words
An elbow or knee pad comprising a pad assembly having a foam backing with a recess and a dense, modified polyurethane insert in said recess, said backing being a polyurethane foam, and said dense modified polyurethane insert being formed of a non-cellular polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, having a compression set of less than 15% and elongation at break of at least 500%, and a recovery which is delayed after compression by at least 0.7 seconds.
Claim 2
Dependent Claim
80 words
An elbow or knee pad comprising a pad assembly having a foam backing with a recess and a dense, modified polyurethane insert in said recess, said backing being a polyurethane foam, and said dense modified polyurethane insert being formed of a non-cellular polyurethane of essentially linear structure containing unsatisfied hydroxyl groups, having a compression set of less than 15% and elongation at break of at least 500%, and a recovery which is delayed after compression by at least 0.7 seconds.
Claim 3
Dependent Claim
23 words
The pad of claim 1 wherein said polyurethane foam backing has a hardness on the Shore 00 scale of between 40 and 50.
Claim 4
Dependent Claim
23 words
The pad of claim 2 wherein said modified polyurethane has a Shore hardness measured on the 00 scale of between 20 and 70.
Claim 5
Dependent Claim
21 words
The pad of claim 3 including an elasticized sleeve, and said pad assembly having a fabric covering connected with said sleeve.
Claim 6
Dependent Claim
15 words
The pad of claim 1 wherein said recess is defined by a skin of polyurethane.
Claim 7
Dependent Claim
31 words
An elbow or knee pad comprising a pad assembly having a foam backing with a recess and a dense, modified polyurethane insert in said recess, said recess having a four-lobed shape.
Claim 8
Dependent Claim
31 words
An elbow or knee pad comprising a pad assembly having a foam backing with a recess and a dense, modified polyurethane insert in said recess, said recess having a four-lobed shape.
Claim 9
Dependent Claim
13 words
The pad of claim 6 wherein said recess has a beveled side wall.
Claim 10
Independent Claim
53 words
A method of making an elbow or knee pad comprising the steps of forming a foam backing, forming a recess in said backing, and forming a dense, modified, polyurethane insert to fit in said recess, said step of forming a recess including the step of pressing a hot die into said polyurethane foam.
Claim 11
Independent Claim
53 words
A method of making an elbow or knee pad comprising the steps of forming a foam backing, forming a recess in said backing, and forming a dense, modified, polyurethane insert to fit in said recess, said step of forming a recess including the step of pressing a hot die into said polyurethane foam.
Claim 12
Dependent Claim
16 words
The method of claim 8 including the step of covering said backing with a fabric covering.
Claim 13
Dependent Claim
24 words
The method of claim 8 wherein said step of forming an insert includes the step of casting a dense, modified polyurethane in said recess.
Claim 14
Dependent Claim
52 words
The method of claim 10 wherein said step of casting a dense, modified polyurethane in said recess includes casting a polyurethane having unsatisfied hydroxyl groups, a compression set less than 15%, an elongated at break of at least 500%, and a recovery which is delayed after compression by at least 0.7 seconds.
Claim 15
Dependent Claim
38 words
The method set forth in claim 8 wherein the step of pressing a hot die into said polyurethane foam melts said polyurethane foam to form a skin defining said recess into which said dense, modified polyurethane is cast.
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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 |