US3924362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sanding pad assembly
Assignee: Formax Manufacturing Corp
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Filing: 1974-10-25
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Granted: 1975-12-09
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Expires: 1994-10-25
Abstract
Abstract A sanding pad assembly made of foam material and having a core and an outer layer of different hardnesses and in one form having a soft, flexible foam inner core and a tough semi-rigid foam outer layer and in another form having a soft, flexible foam outer layer and a tough semi-rigid inner core.
Inventors
- 👤 Howard J Mcaleer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:33
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/14; B24D13/147
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
55 words
A sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core of soft flexible foam material and an outer layer on said core of a semi-rigid foam material extending over the work surfaces of said pad member.
Claim 2
Dependent Claim
55 words
A sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core of soft flexible foam material and an outer layer on said core of a semi-rigid foam material extending over the work surfaces of said pad member.
Claim 3
Dependent Claim
16 words
The pad assembly of claim 1 with said outer layer terminating in a tough outer skin.
Claim 4
Dependent Claim
14 words
The pad assembly of claim 1 and said core being substantially open cell structure.
Claim 5
Dependent Claim
16 words
The pad assembly of claim 1 with said outer layer being substantially a closed cell structure.
Claim 6
Dependent Claim
20 words
The pad assembly of claim 1 with said core being a flexible polyurethane foam having a substantially open cell structure.
Claim 7
Dependent Claim
21 words
The pad assembly of claim 1 with said outer layer being a semi-rigid polyurethane foam having a substantially closed cell structure.
Claim 8
Dependent Claim
50 words
The pad assembly of claim 1 with said core having a hardness in the range of from about 10 to about 60 on the Shore A scale and with said outer layer having a hardness in the range of from about 30 to about 100 on the Shore A scale.
Claim 9
Dependent Claim
50 words
The pad assembly of claim 1 with said core having a hardness in the range of from about 10 to about 60 on the Shore A scale and with said outer layer having a hardness in the range of from about 50 to about 100 on the Shore A scale.
Claim 10
Dependent Claim
33 words
The sanding pad assembly of claim 1 with said pad member having a transition zone between said core and said outer layer, said zone being comprised of semi-rigid foam interfoamed with flexible foam.
Claim 11
Dependent Claim
38 words
The sanding pad assembly of claim 1 wherein said outer layer has a thickness of from about one-sixteenth inch to about one-fourth inch where said pad member is approximately 1 1/4 inches to around 1 1/2 inches thick.
Claim 12
Dependent Claim
51 words
The sanding pad assembly of claim 9 wherein said outer layer has a thickness of from about one-sixteenth inch to about one-fourth inch, and said transition zone being about one-eighth inch to about one-fourth inch thick where said pad member is approximately 1 1/4 inches to around 1 1/2 inches thick.
Claim 13
Dependent Claim
46 words
The pad assembly of claim 1 with said core being a flexible polyurethane foam of a polyester resin and having a substantially open cell structure and with said outer layer being a semi-rigid polyurethane foam of a polyether resin and having a substantially closed cell structure.
Claim 14
Dependent Claim
37 words
The pad assembly of claim 1 with said back up means comprising a rigid disc secured to one side of said core with the material of said core extending over the radially outer periphery of said disc.
Claim 15
Dependent Claim
27 words
The pad assembly of claim 1 with said back up means comprising a rigid disc secured to said outer layer at one side of said pad member.
Claim 16
Dependent Claim
98 words
The sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core of flexible polyurethane foam of a substantially open cell structure, said pad member further comprising an outer layer of semi-rigid polyurethane foam of a substantially closed cell structure, said core having a hardness in the range of from about 10 to about 60 on the Shore A scale, said outer layer having a hardness in the range of from about 30 to about 100 on the Shore A scale.
Claim 17
Dependent Claim
98 words
The sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core of flexible polyurethane foam of a substantially open cell structure, said pad member further comprising an outer layer of semi-rigid polyurethane foam of a substantially closed cell structure, said core having a hardness in the range of from about 10 to about 60 on the Shore A scale, said outer layer having a hardness in the range of from about 30 to about 100 on the Shore A scale.
Claim 18
Dependent Claim
39 words
The pad assembly of claim 15 with said pad member having a transition zone between said core and said outer layer which is comprised of semi-rigid foam of said outer layer interfoamed with the flexible foam of said core.
Claim 19
Dependent Claim
22 words
The pad assembly of claim 16 with saiD outer layer having a thickness of from about one-sixteenth inch to about one-fourth inch.
Claim 20
Dependent Claim
22 words
The pad assembly of claim 17 with said transition zone having a thickness of from about one-eighth inch to about one-fourth inch.
Claim 21
Dependent Claim
29 words
The pad of claim 17 with said core being of a foam of a polyester resin and with said outer layer being of a foam of a polyether resin.
Claim 22
Dependent Claim
37 words
The pad assembly of claim 19 with said back up means comprising a rigid disc secured to one side of said core with the material of said core extending over the radially outer periphery of said disc.
Claim 23
Dependent Claim
27 words
The pad assembly of claim 19 with said back up means comprising a rigid disc secured to said outer layer at one side of said pad member.
Claim 24
Dependent Claim
76 words
A sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core and an outer layer, one of said core and said outer layer being made of soft flexible foam material, the other of said core and said outer layer being made of a semi-rigid foam material, said outer layer extending over the work surfaces of said pad member.
Claim 25
Dependent Claim
76 words
A sanding pad assembly comprising: a pad member, back up means secured to said pad member for supporting said pad member for rotation, said pad member comprising a core and an outer layer, one of said core and said outer layer being made of soft flexible foam material, the other of said core and said outer layer being made of a semi-rigid foam material, said outer layer extending over the work surfaces of said pad member.
Claim 26
Dependent Claim
16 words
The pad assembly of claim 22 with said outer layer terminating in a tough outer skin.
Claim 27
Dependent Claim
15 words
The pad assembly of claim 22 with said core being substantially a closed cell structure.
Claim 28
Dependent Claim
16 words
The pad assembly of claim 22 with said outer layer being substantially an open cell structure.
Claim 29
Dependent Claim
21 words
The pad assembly of claim 22 with said outer layer being a flexible polyurethane foam having a substantially open cell structure.
Claim 30
Dependent Claim
20 words
The pad assembly of claim 22 with said core being a semi-rigid polyurethane foam having a substantially closed cell structure.
Claim 31
Dependent Claim
50 words
The pad assembly of claim 22 with said outer layer having a hardness in the range of from about 10 to about 60 on the Shore A scale and with said core having a hardness in the range of from about 30 to about 100 on the Shore A scale.
Claim 32
Dependent Claim
77 words
The pad assembly of claim 22 with said outer layer being a flexible polyurethane foam of a polyester resin and having a substantially open cell structure and with said core being a semi-rigid polyurethane foam foam of a polyether resin and having a substantially closed cell structure, said back up means comprising a rigid disc secured to one side of said core with the material of said core extending over the radially outer periphery of said disc.
Claim 33
Dependent Claim
51 words
The sanding pad assembly of claim 29 wherein said outer layer has a thickness of from about one-sixteenth inch to about one-fourth inch, and said transition zone being about one-eighth inch to about one-fourth inch thick where said pad member is approximately 1 1/4 inches to around 1 1/2 inches thick.
Claim 34
Dependent Claim
39 words
The pad assembly of claim 29 with said pad member having a transition zone between said core and said outer layer which is comprised of semi-rigid foam of said core interfoamed with the flexible foam of said outer layer.
References Cited (Backward Citations)
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |