Patent US2171301A successfully refreshed from Google Patents.
Patent US4233929A successfully refreshed from Google Patents.
US4233929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the treatment of timber
Assignee: Protim International Ltd
•
Filing: 1979-01-08
•
Granted: 1980-11-18
•
Expires: 1999-01-08
Abstract
Abstract An apparatus for the treatment of timber comprises a vessel having at least three chambers arranged in series for passage of the timber therethrough on conveyor belts or the like. There is means for drawing a vacuum in each of the end chambers and means for spraying the timber with a preservative liquid in an intermediate chamber, the vacuums being maintained during passage of the timber through the end chambers, by means of seals which are arranged to close and open automatically as the timber enters and leaves the respective vacuum chambers.
Inventors
- 👤 Robert G. Hurst
- 👤 Alan L. Pinner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:51
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/08; B27K3/10; B05; B05B; B05B16/00; B05B16/90; B05B16/95; B27K3/0228; B27K3/0278; B05B1/00; B05B1/14; B05B1/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An apparatus for the continuous treatment of a sucession of individual generally elongate items of timber, comprising a vessel having at least three chambers arranged in series for passage of the timber therethrough, means for drawing a vacuum in each of the end chambers and means for spraying the timber with preservative liquid in an intermediate chamber, guide means for holding the timbers upright, conveying means for transporting the upright timber sequentially through said chambers, sealing means adapted to maintain the vacuums in the end chambers, said sealing means being located at the ends of the vessel and between said chambers and timing means to control the period of treatment in the chambers.
Claim 2
Independent Claim
113 words
An apparatus for the continuous treatment of a sucession of individual generally elongate items of timber, comprising a vessel having at least three chambers arranged in series for passage of the timber therethrough, means for drawing a vacuum in each of the end chambers and means for spraying the timber with preservative liquid in an intermediate chamber, guide means for holding the timbers upright, conveying means for transporting the upright timber sequentially through said chambers, sealing means adapted to maintain the vacuums in the end chambers, said sealing means being located at the ends of the vessel and between said chambers and timing means to control the period of treatment in the chambers.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1, in which the vessel is elongated and the chambers are arranged in line.
Claim 4
Dependent Claim
22 words
The apparatus of claim 2, wherein said conveying means comprises at least one belt arranged to transport the timber through the chambers.
Claim 5
Dependent Claim
30 words
The apparatus of claim 1 wherein the sealing means comprise seals provided on doors and which are arranged to open and close automatically to allow passage of the timber therethrough.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4, in which the means for spraying in the intermediate chamber comprises a high pressure spray to produce a cascade or deluge effect.
Claim 7
Dependent Claim
45 words
The apparatus of claim 5, additional comprising a tank of liquid in the floor of the spray chamber, and wherein the timber being treated is passed through the chamber such that the lowermost portion of the timber is immersed in the liquid in said tank.
Claim 8
Dependent Claim
15 words
The apparatus of claim 1 wherein said guide means extends through each of said chambers.
References Cited (Backward Citations)
US2334586A
Cited
US2858795A
Cited
US2853047A
Cited
US3469560A
Cited
US3759217A
Cited
US3895138A
Cited
US3859046A
Cited
US3842796A
Cited
US3968276A
Cited
US4062991A
Cited
US4142009A
Cited
US3981791A
Cited
US4086056A
Cited
US4184448A
Cited
US4191795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |