Patent US3759217A successfully refreshed from Google Patents.
US3759217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for impregnating wood with synthetic resin
Assignee: Hull Corp
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Filing: 1969-06-05
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Granted: 1973-09-18
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Expires: 1989-06-05
Abstract
Abstract Pieces of wood in a perforate container in a chamber are evacuated and then immersed in a liquid mixture of monomeric synthetic resin and catalyst under elevated pressure. The container of resin-impregnated wood then is transferred to a rotary chamber and tumbled under elevated gas pressure and controlled polymerization temperature to effect polymerization of the impregnated resin.
Inventors
- 👤 K Wiegmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:38
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/08; B27K3/10; B27K3/15; B27K3/025; B27K3/0278; B27K5/00; B27K5/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
The apparatus of claim 1 including temperature responsive control means communicating with the interior of the polymerizer chamber and operatively connected to the source of heat exchange fluid for varying the temperature of the latter to said passageway means.
Claim 2
Dependent Claim
27 words
The apparatus of claim 1 wherein the source of variable temperature heat exchange fluid includes a source of refrigerant fluid and a source of elevated temperature fluid.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1 including means selectively communicating the polymerizer chamber with and sealing said chamber from a source of gas under pressure for conducting heat between said passageway means and wood in the perforate container.
Claim 4
Dependent Claim
77 words
In apparatus for impregnating wood with synthetic resin, a. a polymerizer chamber supported for rotation on an axis disposed angularly with respect to the longitudinal axis of the chamber, b. a perforate container confined removably in the polymerizer chamber and adapted to contain wood pieces impregnated with resin, c. passageway means in the polymerizer chamber for the circulation of heat exchange fluid, and d. a source of variable temperature heat exchange fluid communicating with the passage means.
Claim 5
Dependent Claim
39 words
The apparatus of claim 5 including temperature responsive control means communicating with the interior of the polymerizer chamber and operatively connected to the source of heat exchange fluid for varying the temperature of the latter to said passageway means.
Claim 6
Dependent Claim
27 words
The apparatus of claim 5 wherein the source of variable temperature heat exchange fluid includes a source of refrigerant fluid and a source of elevated temperature fluid.
Claim 7
Dependent Claim
25 words
The apparatus of claim 5 including spacer means between the polymerizer chamber and perforate container for supporting the latter in spaced relation to said chamber.
Claim 8
Dependent Claim
25 words
The apparatus of claim 5 including clamp means on the polymerizer chamber releasably engaging the perforate container for securing the latter releasably in said chamber.
Claim 9
Dependent Claim
36 words
The apparatus of claim 5 including means selectively communicating the polymerizer chamber with and sealing said chamber from source of gas under pressure for conducting heat between said passageway means and wood in the perforate container.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |