US3624233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to improve the impregnation of wood
Assignee: Individual
•
Filing: 1969-09-09
•
Granted: 1971-11-30
•
Expires: 1989-09-09
Abstract
Abstract A method to impregnate wood with a preservative, fire-retarding, stabilizing or the like wood treating agent, comprising compressing the wood across its grain for a short period of time, allowing the wood to recover from the compression and impregnating the wood with the agent while varying the pressure conditions of the wood environment.
Inventors
- 👤 Marcel Goulet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/0278; B27K3/0285; B27K2240/00; B27K2240/30; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A method as claimed in claim 1, wherein the impregnating step comprises first placing the wood in a treatment zone at a pressure below atmospheric pressure, then allowing the treatment zone pressure to increase to atmospheric pressure while introducing the treating fluid and then increasing the treatment zone pressure to above atmospheric pressure.
Claim 2
Dependent Claim
26 words
A method as claimed in claim 1, wherein the compression step is effected at a pressure in the zone of the elastic limit of the wood.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1, wherein the compressing step is effected at a pressure which is slightly less than the pressure which would permanently damage the wood.
Claim 4
Dependent Claim
40 words
A method as claimed in claim 1, wherein the wood is in the shape of lumber and the compressing step is effected by passing said lumber between at least 1 pair of pressure rollers effecting compression in a single direction.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 5, wherein the lumber passed between said rollers at a speed of about 50 feet per minute.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 5, wherein said pressure rollers effect a thickness reduction of on said lumber lying between 5 and 20 percent of its thickness.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 7, further including steaming said lumber before subjecting it to said compression step.
Claim 8
Dependent Claim
13 words
A method as claimed in claim 1, wherein said wood is Eastern Spruce.
Claim 9
Dependent Claim
13 words
A method as claimed in claim 2, wherein said wood is Eastern Spruce.
Claim 10
Dependent Claim
13 words
A method as claimed in claim 3, wherein said wood is Eastern Spruce.
Claim 11
Dependent Claim
13 words
A method as claimed in claim 7, wherein said wood is Eastern Spruce.
Claim 12
Dependent Claim
13 words
A method as claimed in claim 8, wherein said wood is Eastern Spruce.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |