US4853273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill board and method of making the same
Assignee: ELMATCO PRODUCTS INCORPORATED PO BOX 6506 HAMDEN CONNECTICUT 06517-0506
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Filing: 1987-12-21
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Granted: 1989-08-01
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Expires: 2007-12-21
Abstract
Abstract A backup board for use when drilling through a circuit board having a conductive layer therein, the backup board comprises a lamination of outer planar sheets, and an inner core of a double wall corrugated material, the outer sheets being impregnated with a thermosetting adhesive, the sheets and the core being subjected to heat and pressure to form a laminate where said corrugations fold over and bond to said outer planar sheets, to provide a backup board giving surface support by said outer sheets with a less rigid core therebetween.
Inventors
- 👤 Earl C. Harris, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:32
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B23; B23B; B23B35/00; B23B35/005; B32B15/00; B32B15/04; B32B15/12; B32B15/20; B32B29/00; B32B29/002; B32B29/005; B32B29/08; H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0044; H05K3/0047; B23B2228/00; B23B2228/36; B32B2260/00; B32B2260/02; B32B2260/028; B32B2307/00; B32B2307/20; B32B2307/202; B32B2311/00; B32B2311/24; B32B2317/00; B32B2317/12; B32B2317/122; B32B2317/125; B32B2317/127; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0284; H05K2201/0293; H05K2203/00; H05K2203/01; H05K2203/0147; H05K2203/0152; H05K2203/0156; H05K2203/02; H05K2203/0214; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1049; Y10T156/1051; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24628; Y10T428/24669; Y10T428/24686; Y10T428/24694; Y10T428/24711; Y10T428/24802; Y10T428/24934
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A backup board having high surface hardness for use when drilling through a circuit board having an electrically conductive layer thereon, said backup board comprising a lamination of outer planar sheets, and an inner core of a double wall corrugated material, said double wall corrugated material having outer planar sheets, a central planar sheet and corrugated paper between each of said outer sheets and said central sheet, said outer sheets being impregnated with a thermosetting adhesive, said sheets and said core being subjected to heat and pressure to form a laminate where said thermosetting adhesive bonds said outer sheets to the outer sheets of said double wall corrugated material, said corrugations fold over to provide a backup board giving surface support by said outer sheets with a less rigid core therebetween.
Claim 2
Dependent Claim
131 words
A backup board having high surface hardness for use when drilling through a circuit board having an electrically conductive layer thereon, said backup board comprising a lamination of outer planar sheets, and an inner core of a double wall corrugated material, said double wall corrugated material having outer planar sheets, a central planar sheet and corrugated paper between each of said outer sheets and said central sheet, said outer sheets being impregnated with a thermosetting adhesive, said sheets and said core being subjected to heat and pressure to form a laminate where said thermosetting adhesive bonds said outer sheets to the outer sheets of said double wall corrugated material, said corrugations fold over to provide a backup board giving surface support by said outer sheets with a less rigid core therebetween.
Claim 3
Dependent Claim
17 words
The backup board of claim 1 where said core also is impregnated with a heat sensitive material.
Claim 4
Dependent Claim
15 words
The backup board of claim 1 where said outer sheet comprises two adhesive impregnated sheets.
Claim 5
Dependent Claim
18 words
The backup board of claim 1 where said outer sheet have a layer of a metallic foil thereon.
Claim 6
Dependent Claim
13 words
The backup board of claim 1 where said adhesive is a thermosetting resin.
Claim 7
Independent Claim
121 words
A method of making a drill board having high surface hardness and a yielding core which comprises the steps of providing first and second outer sheets of thin sheet material impregnated with a thermosetting adhesive, providing a core material of double wall corrugated material, said double wall corrugated material having outer planar sheets, a central planar sheet and corrugated paper between each of said outer sheet and said control sheet positioning said core material between said first and second outer sheets and laminating said outer sheets and core material together under heat and pressure to cause said corrugations to fold over onto each other until said adhesive is cured and bonds said outer sheets to the outer sheets of said core.
Claim 8
Independent Claim
121 words
A method of making a drill board having high surface hardness and a yielding core which comprises the steps of providing first and second outer sheets of thin sheet material impregnated with a thermosetting adhesive, providing a core material of double wall corrugated material, said double wall corrugated material having outer planar sheets, a central planar sheet and corrugated paper between each of said outer sheet and said control sheet positioning said core material between said first and second outer sheets and laminating said outer sheets and core material together under heat and pressure to cause said corrugations to fold over onto each other until said adhesive is cured and bonds said outer sheets to the outer sheets of said core.
Claim 9
Dependent Claim
19 words
The method of claim 6 where said outer sheets are each two sheets both impregnated with said thermosetting adhesive.
Claim 10
Dependent Claim
22 words
The method of claim 6 wherein said outer sheets are paper impregnated with said adhesive with an outer metallic foil adhered thereto.
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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) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |