US4086056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for impregnation of timber
Assignee: Hicksons Timber Impregnation Co G B Ltd
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Filing: 1976-04-07
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Granted: 1978-04-25
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Expires: 1996-04-07
Abstract
Abstract A process of impregnating one or more timber articles, such as timber doors, with a treatment agent in which the articles are placed in a treatment chamber which is then filled with the treatment agent. The treatment agent is then pressurized, preferably by pumping more treatment agent into the chamber, to force the treatment agent into the articles. This pressurizing step is performed quickly, for example, within between 5 and 25 seconds, and the articles are then removed from the chamber.
Inventors
- 👤 Arthur Neville Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:53
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/08; B27K3/0278; B27K5/00; B27K5/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
A process for the impregnation of at least one article comprised of timber with a predetermined amount of a treatment agent comprising the steps of: positioning an article comprised of timber in a treatment chamber; isolating the interior of the treatment chamber from the ambient atmosphere; filling the treatment chamber with a treatment agent; pressurizing the treatment agent in the treatment chamber to a predetermined level for a period not exceeding 3 minutes to rapidly force the predetermined amount of treatment agent into the article in a single pressurization step; and relieving the pressure of the treatment agent at the end of said single pressurization step and removing the article from the treatment chamber without substantial delay.
Claim 2
Dependent Claim
117 words
A process for the impregnation of at least one article comprised of timber with a predetermined amount of a treatment agent comprising the steps of: positioning an article comprised of timber in a treatment chamber; isolating the interior of the treatment chamber from the ambient atmosphere; filling the treatment chamber with a treatment agent; pressurizing the treatment agent in the treatment chamber to a predetermined level for a period not exceeding 3 minutes to rapidly force the predetermined amount of treatment agent into the article in a single pressurization step; and relieving the pressure of the treatment agent at the end of said single pressurization step and removing the article from the treatment chamber without substantial delay.
Claim 3
Dependent Claim
38 words
The process of claim 1 further comprising the step of: delivering the treated article to a drying chamber immediately upon removal from the treatment chamber; and maintaining the treated article in the drying chamber for a predetermined time.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein the step of pressurizing the treatment agent comprises: creating and maintaining an elevated pressure within the treatment chamber for a period of between 5 and 180 seconds.
Claim 5
Dependent Claim
24 words
The process of claim 3 wherein the pressure within the treatment chamber is maintained at an elevated level for between 5 and 25 seconds.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the step of pressurizing the treatment agent comprises: increasing the pressure within the treatment chamber to between 1.5 and 30 kilograms per square centimeter.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein the pressure created within the treatment chamber is in the range 1.5 to 7.0 kilograms per square centimeter.
Claim 8
Dependent Claim
24 words
The process of claim 6 wherein the increased pressure is maintained in the treatment chamber for a period of between 5 and 25 seconds.
Claim 9
Dependent Claim
24 words
The process of claim 5 wherein the increased pressure is maintained in the treatment chamber for a period of between 5 and 180 seconds.
Claim 10
Dependent Claim
30 words
The process of claim 8 wherein the step of filling the treatment chamber comprises: delivering the treatment agent from a reservoir to the treatment chamber under the influence of gravity.
Claim 11
Dependent Claim
22 words
The process of claim 9 wherein the treated article is retained in the drying chamber for a period not exceeding 120 minutes.
Claim 12
Dependent Claim
34 words
The process of claim 10 further comprising: recovering treatment agent released from the article in the drying chamber; and returning the recovered treatment agent to the reservoir from which the treatment chamber is filled.
Claim 13
Dependent Claim
39 words
The process of claim 9 wherein the step of increasing the pressure comprises: pumping a predetermined amount of treatment agent from a reservoir into the treatment chamber subsequent to the filling of the treatment chamber with the treatment agent.
Claim 14
Dependent Claim
24 words
The process of claim 12 further comprising the step of: delivering the treated article to a drying chamber upon removal from the treatment chamber.
Claim 15
Dependent Claim
19 words
The process of claim 13 wherein the treated article is maintained in the drying chamber for approximately 30 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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |