US4820570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated insulation
Assignee: Fujikura Ltd
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Filing: 1986-04-21
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Granted: 1989-04-11
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Expires: 2006-04-21
Abstract
Abstract A laminated insulation paper of the type having two cellulose layers separated by a plastic layer is formed with through holes in the plastic layer such that the respective cellulose layers may contact one another through the through holes. The insulation paper is formed by pressing heated, rounded pins into one of the cellulose layers while backing the other layer until the two cellulose layers are contacted through the hole thus formed in the plastic layer.
Inventors
- 👤 Masakazu Hasegawa
- 👤 Michio Takaoka
- 👤 Syotaroh Yoshida
- 👤 Kazuya Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B3/00; B32B3/26; B32B3/266; B32B7/00; B32B7/04; H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B3/52; H01B7/00; H01B7/02; H01B7/0208; H01B7/0225; B32B2307/00; B32B2307/20; B32B2307/206; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24339; Y10T428/24347; Y10T428/24802; Y10T428/24826; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
A laminated insulation paper, comprising; an integral construction of two sheets of cellulose paper and a film-like plastic sheet sandwiched therebetween, through holes locally provided in said plastic sheet formed by contact with a heated pin, at least one of said two sheets of cellulose paper being pressed into said through holes by said pin to fill said through holes, said two sheets of cellulose paper directly contacting with each other by means of said through holes.
Claim 2
Dependent Claim
77 words
A laminated insulation paper, comprising; an integral construction of two sheets of cellulose paper and a film-like plastic sheet sandwiched therebetween, through holes locally provided in said plastic sheet formed by contact with a heated pin, at least one of said two sheets of cellulose paper being pressed into said through holes by said pin to fill said through holes, said two sheets of cellulose paper directly contacting with each other by means of said through holes.
Claim 3
Dependent Claim
50 words
An article as claimed in claim 1, wherein said through holes are formed only in said plastic sheet, indentations being provided on at least one of said cellulose paper sheets in correspondence with said through holes whereby inner surfaces of said two cellulose paper sheets are contacted with one another.
Claim 4
Independent Claim
109 words
A method of making a laminated insulation paper including a plastic portion formed with through holes, comprising; pressing a heated pin against at least one of two sheets of cellulose paper comprising said laminated insulation paper, which paper is integrally formed of said two sheets of cellulose paper and a film-like plastic sheet sandwiched there-between, heating and melting said plastic sheet through said cellulose paper to form through holes in said plastic sheet at a portion corresponding to the position of said pin, and pressing by said pin until a portion of at least one of said cellulose sheets beneath said pin directly contacts the other said cellulose sheets.
Claim 5
Independent Claim
109 words
A method of making a laminated insulation paper including a plastic portion formed with through holes, comprising; pressing a heated pin against at least one of two sheets of cellulose paper comprising said laminated insulation paper, which paper is integrally formed of said two sheets of cellulose paper and a film-like plastic sheet sandwiched there-between, heating and melting said plastic sheet through said cellulose paper to form through holes in said plastic sheet at a portion corresponding to the position of said pin, and pressing by said pin until a portion of at least one of said cellulose sheets beneath said pin directly contacts the other said cellulose sheets.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 3, further including preheating said synthetic insulation paper prior to said pressing.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 3, further comprising transporting said synthetic insulation paper away from a station where said pressing is carried out at a selectible speed.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 3, including simultaneously pressing a plurality of said heated pins against one of said sheets.
Claim 9
Dependent Claim
23 words
A method as claimed in claim 6, wherein said pins are maintained at a temperature above the melting temperature of said plastic sheet.
Claim 10
Dependent Claim
25 words
A method as claimed in claim 6, said pins being supported on a plate, and said synthetic insulation paper being supported on a heated plate.
Claim 11
Dependent Claim
17 words
A method as claimed in claim 6, further including backing said laminated insulation paper during said pressing.
Claim 12
Dependent Claim
23 words
A method as claimed in claim 9, wherein the temperature of said backing is maintained below the melting temperature of said plastic sheet.
Claim 13
Dependent Claim
17 words
A method as claimed in claim 6, said pins being rounded and disposed on a rotatable roll.
Claim 14
Dependent Claim
22 words
A method as claimed in claim 11, further including backing said synthetic insulation paper during said pressing with a heated backing roller.
Claim 15
Dependent Claim
24 words
A method as claimed in claim 11, wherein said rotatable roll comprises a heat pipe for uniformly transmitting heat to said plurality of pins.
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) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |