Patent US3779797A successfully refreshed from Google Patents.
US3779797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the impregnation and surface treatment of porous board type products
Assignee: Individual
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Filing: 1968-09-20
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Granted: 1973-12-18
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Expires: 1988-09-20
Abstract
Abstract The method has been applied on board type products, which have been subjected to low pressure and effecting impregnation rapidly within a few seconds and polymerisation in hot press during 1 - 5 minutes, the impregnating medium generally consisting of a mixture of unsaturated polyester and styrene monomer. By regulating underpressure and viscosity and by using fillers the plastic quantity is regulated. The penetration depth of the impregnation medium is further controlled by regulating the temperature of the impregnating medium and the impregnating time. Improved absorption is achieved by vibrating the impregnating medium or the board.
Inventors
- 👤 A Makinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:39
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/06; B05D7/08; B05D1/00; B05D1/18; B05D3/00; B05D3/04; B05D3/0493; B27; B27K; B27K3/00; B27K3/02; B27K3/08; B27K3/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
28 words
The method according to claim 1 wherein said vacuum treatment time does not exceed 5 minutes and said short period of continuining immersion does not exceed 5 minutes.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |