Patent US4301187A successfully refreshed from Google Patents.
US4301187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Panel
Assignee: Burch Jack A Ltd
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Filing: 1979-10-22
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Granted: 1981-11-17
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Expires: 1999-10-22
Abstract
Abstract A method of absorbing resin into part of a panel of particleboard to provide local strength increases in that part. The method comprises subjecting the part to an electric field, immersing the panel in the resin; and then resubjecting the panel to the electric field to cure the resin. A particleboard panel is also disclosed. The panel has a main body with a specific gravity in the range 0.2 to 0.5 but at least one area on its periphery has a specific gravity in the range 0.7 to 1.0. The one area is impregnated with a synthetic resin. The panel is particularly useful in door production as it is strong but cheap.
Inventors
- 👤 Jack A. Burch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:50
CPC Classifications
B; B27; B27N; B27N7/00; B05; B05D; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/145; B05D3/147; B05D7/00; B05D7/06; C; C08; C08L; C08L97/00; C08L97/02; B27K; B27K3/00; B27K3/02; B27K3/0207; B27K3/15; C08L61/00; C08L61/04; C08L61/06; C08L61/20; C08L61/22; C08L61/24; C08L61/26; C08L61/28; C08L75/00; E; E06; E06B; E06B3/00; E06B3/70; E06B2003/7046; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24793; Y10T428/25; Y10T428/253
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A method of absorbing resin into a predetermined part of a panel of particleboard to provide local strength increases in the predetermined part, the method compromising preheating the predetermined part by subjecting the part to an electric field; immersing the panel in the resin; and resubjecting the panel to the electric field to reheat the predetermined part to cure the resin.
Claim 2
Independent Claim
61 words
A method of absorbing resin into a predetermined part of a panel of particleboard to provide local strength increases in the predetermined part, the method compromising preheating the predetermined part by subjecting the part to an electric field; immersing the panel in the resin; and resubjecting the panel to the electric field to reheat the predetermined part to cure the resin.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 in which the resin is selected from urea formaldehyde, phenol formaldehyde melamine resins and isocyanates.
Claim 4
Dependent Claim
38 words
A method as claimed in claim 1 in which the particleboard has a specific gravity in the range 0.2 to 0.5 which is increased at the predetermined parts to a specific gravity in the range 0.7 to 1.0.
Claim 5
Dependent Claim
36 words
A method as claimed in claim 1 in which the electric field is produced between metal plates connected to a high power electric source and the predetermined parts of the board are positioned between the plates.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 4 in which the high power is about 12 kilowatts.
Claim 7
Dependent Claim
36 words
A method as claimed in claim 1 in which the panel is for use as a door and the predetermined parts are at least the parts to receive door hardware selected from hinges, locks and closers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |