US4567115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure impregnation of wood poles for preservation
Assignee: Bell Canada Inc
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Filing: 1984-07-30
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Granted: 1986-01-28
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Expires: 2004-07-30
Abstract
Abstract A treatment for wood poles, as used for telecommunications and electric power poles, to reduce surface hardening comprises modifying the standard treatment solution by the addition of a polymer of ethylene oxide. A surface active agent is a further possible additive, and reduction of the hexavalent chrome ion in the standard solution is a further modification.
Inventors
- 👤 William P. Trumble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:35
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/16; B27K3/28; B27K3/02; B27K3/15; B27K3/22; B27K3/26; C; C08; C08L; C08L97/00; C08L97/02; C08L71/00; C08L71/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
26 words
A method of treating wood, comprising the step of exposing wood to an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol.
Claim 2
Independent Claim
26 words
A method of treating wood, comprising the step of exposing wood to an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1, wherein said polyethylene glycol has a molecular weight in the range from about 100 to about 2,000.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 2, wherein said molecular weight range of said polyethylene glycol is from about 500 to about 2,000.
Claim 5
Dependent Claim
55 words
A method as claimed in claim 3, comprising the steps of treating said wood with an aqueous solution consisting essentially of (1) water, (2) about 2 to 2.56% concentration of chromium, copper and arsenic salts or oxides and (3) about 0.5% to 10% concentration of a polyethylene glycol having a molecular weight of about 1,000.
Claim 6
Dependent Claim
19 words
A method as claimed in claim 1, wherein said aqueous solution further consists essentially of a surface active agent.
Claim 7
Dependent Claim
54 words
A method as claimed in claim 1, wherein said exposing step comprises treating said wood in a chamber by first evacuating said chamber for a first predetermined period after placing said wood in said chamber, and then pressure treating said wood with said aqueous solution at a predetermined pressure for a second predetermined period.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 1, wherein said aqueous solution has a pH below about 2.0 and a temperature below about 85° F.
Claim 9
Dependent Claim
28 words
A method as claimed in claim 1, wherein said aqueous solution has a pH between about 1.7 and 2.0 and a temperature between about 70° and 85° F.
Claim 10
Dependent Claim
15 words
A method as claimed in claim 1, wherein said wood is sapwood of pole stock.
Claim 11
Dependent Claim
15 words
A method as claimed in claim 6, wherein said wood is sapwood of pole stock.
Claim 12
Dependent Claim
35 words
A method as claimed in claim 1, wherein said aqueous solution is Type C standard CCA solution, as specified in ASTM standard D1625-71, to which said polyethylene glycol is added prior to said exposing step.
Claim 13
Dependent Claim
45 words
A wood pole produced by a process comprising the step of treating a wood pole with an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol, said wood pole displaying at least one characteristic of improved climbability and resistance to checking.
Claim 14
Dependent Claim
45 words
A wood pole produced by a process comprising the step of treating a wood pole with an aqueous solution consisting essentially of water, hexavalent chromium, copper, arsenic and polyethylene glycol, said wood pole displaying at least one characteristic of improved climbability and resistance to checking.
Claim 15
Dependent Claim
24 words
A wood pole as claimed in claim 12, wherein said polyethylene glycol has a molecular weight in the range about 100 to about 2,000.
Claim 16
Dependent Claim
22 words
A wood pole as claimed in claim 12, wherein said molecular weight is in the range from about 500 to about 2,000.
Claim 17
Dependent Claim
60 words
A wood pole as claimed in claim 14, wherein said process comprises the step of treating said wood pole with an aqueous solution consisting essentially of (1) water, (2) about 2 to 2.5% concentration of chromium, copper and arsenic salts or oxides and (3) about 0.5% to 10% concentration of a polyethylene glycol having a molecular weight of about 1,000.
Claim 18
Dependent Claim
20 words
A wood pole as claimed in claim 12, wherein said aqueous solution further consists essentially of a surface active agent.
Claim 19
Dependent Claim
55 words
A wood pole as claimed in claim 12, wherein said treating step comprises treating said wood pole in a chamber by evacuating said chamber for a first predetermined period after placing said wood in said chamber, and then pressure treating said wood with said aqueous solution at a predetermined pressure for a second predetermined period.
Claim 20
Dependent Claim
25 words
A wood pole as claimed in claim 12, wherein said aqueous solution has a pH below about 2.0 and a temperature below about 85° F.
Claim 21
Dependent Claim
29 words
A wood pole as claimed in claim 12, wherein said aqueous solution has a pH between about 1.7 and 2.0 and a temperature between about 70° and 85° F.
Claim 22
Dependent Claim
22 words
A wood pole as claimed in claim 12, wherein of said wood pole comprises sapwood which is softened by said treating step
Claim 23
Dependent Claim
18 words
A wood pole as claimed in claim 12, said wood pole being a telecommunications or electric power pole.
Claim 24
Dependent Claim
36 words
A wood pole as claimed in claim 12, wherein said aqueous solution is Type C standard CCA solution, as specificed in ASTM standard D1625-71, to which said polyethylene glycol is added prior to said exposing step.
References Cited (Backward Citations)
US3832463A
Cited
US4313976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |