US4376142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for finishing fiberboard utilizing a frothed prime coat
Assignee: Armstrong World Industries Inc
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Filing: 1980-08-25
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Granted: 1983-03-08
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Expires: 2000-08-25
Abstract
Abstract In a method for prime coating fiberboard products the improvement wherein a foaming agent is added to a conventional aqueous latex based prime coating and the coating aerated to give a frothed prime coating having a consistency of 500 to 750 grams per liter, the frothed coating applied to the board product at a rate of 220 to 320 grams per square meter, and heated to collapse the froth and dry the coating.
Inventors
- 👤 James A. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:31
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/06; B05D7/08; C; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/48; C04B41/50; C04B41/5025; B05D3/00; B05D3/02; B05D3/0254
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A method for preparing a prime-coated fiberboard product, said method comprising the steps of preparing a frothed aqueous latex prime coating comprising a foaming agent, said frothed coating having a consistency of 500 to 750 grams per liter, applying said coating at a rate of 220 to 320 grams per square meter of fiberboard, and exposing the coated fiberboard to heat, thereby collapsing the froth and drying the coating.
Claim 2
Independent Claim
69 words
A method for preparing a prime-coated fiberboard product, said method comprising the steps of preparing a frothed aqueous latex prime coating comprising a foaming agent, said frothed coating having a consistency of 500 to 750 grams per liter, applying said coating at a rate of 220 to 320 grams per square meter of fiberboard, and exposing the coated fiberboard to heat, thereby collapsing the froth and drying the coating.
Claim 3
Dependent Claim
38 words
The method of claim 1 wherein said prime coating comprises, on a solids basis, 49 to 61 parts by weight clay, 3 to 5 parts by weight latex, and from about 0.5 to 1.5 parts by weight surfactant.
Claim 4
Independent Claim
13 words
The method of claims 1 or 2 wherein the latex is polyvinyl acetate.
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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |