Patent US3876449A successfully refreshed from Google Patents.
US3876449A
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US
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Method for impregnating selected regions of a gas permeable blanket
Assignee: Johns Manville Corp
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Filing: 1972-12-22
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Granted: 1975-04-08
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Expires: 1992-12-22
Abstract
Abstract The selective impregnation of a gas permeable glass fiber insulating blanket is carried out by enclosing the blanket within a gas impermeable enclosure except for the surface areas of the regions to be impregnated, applying an impregnate over the exposed surface areas and creating a partial vacuum within the enclosure to draw the impregnate into the regions to be impregnated. The degree of penetration of the impregnate into the blanket is a function of the degree of the vacuum created and the time over which the vacuum is applied. Where relatively deep penetration is desired in certain portions of a region, a partial vacuum or negative pressure zone can be created in the enclosure adjacent these portions.
Inventors
- 👤 Harvell Morton Smith
- 👤 Larry Edward Howard
- 👤 Iii Harry Todd Mitchell
- 👤 Lester Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A METHOD FOR PRODUCING LOCALIZED IMPREGNATION OF A GAS PERMEABLE INSULATING BLANKET COMPRISING: A. ENCLOSING THE BLANKET, EXCEPT FOR SURFACE AREAS OF REGIONS TO BE IMPREGNATED, IN A GAS IMPERMEABLE ENCLOSURE; B. APPLYING AN IMPREGNATE OVER THE EXPOSED SURFACE AREAS OF THE REGIONS TO BE IMPREGNATED; C. CREATING A PARTIAL VACUUM WITHIN THE ENCLOSURE TO DRAW THE IMPREGNATE INTO THE REGIONS TO BE IMPREGNATED; D. APPLYING ADDITIONAL IMPREGNATE TO A PORTION OF THE SURFACE AREAS, AND E. CREATING A PARTIAL VACUUM WITHIN AN ISOLATED PORTION OF THE ENCLOSURE INWARD OF A SPECIFIC REGION.
Claim 2
Independent Claim
93 words
A METHOD FOR PRODUCING LOCALIZED IMPREGNATION OF A GAS PERMEABLE INSULATING BLANKET COMPRISING: A. ENCLOSING THE BLANKET, EXCEPT FOR SURFACE AREAS OF REGIONS TO BE IMPREGNATED, IN A GAS IMPERMEABLE ENCLOSURE; B. APPLYING AN IMPREGNATE OVER THE EXPOSED SURFACE AREAS OF THE REGIONS TO BE IMPREGNATED; C. CREATING A PARTIAL VACUUM WITHIN THE ENCLOSURE TO DRAW THE IMPREGNATE INTO THE REGIONS TO BE IMPREGNATED; D. APPLYING ADDITIONAL IMPREGNATE TO A PORTION OF THE SURFACE AREAS, AND E. CREATING A PARTIAL VACUUM WITHIN AN ISOLATED PORTION OF THE ENCLOSURE INWARD OF A SPECIFIC REGION.
Claim 3
Dependent Claim
20 words
A method as defined in claim 1 wherein: a. the blanket is enclosed except for one edge of the blanket.
Claim 4
Dependent Claim
35 words
A method as defined in claim 1 wherein: a. the degree of penetration of the impregnate into the blanket is controlled by the degree of the vacuum created and the time the vacuum is applied.
Claim 5
Independent Claim
135 words
A method for producing localized impregnation of a gas permeable insulating blanket having two major surfaces with a plurality of edges joining the major surfaces comprising: a. enclosing the blanket except for a surface of one of the edges in a gas impermeable enclosure; b. applying an impregnate over the exposed surface of the edge; c. creating a partial vacuum within the enclosure to draw the impregnate into a portion of the blanket adjacent the edge; d. repeating steps (a), (b) and (c) for at least one other edge of the blanket; e. applying additional impregnate to a portion of one of the edges, and f. creating a partial vacuum within an isolated portion of the enclosure inward of a specific region which includes said portion to draw the additional impregnate into the specific region.
Claim 6
Independent Claim
135 words
A method for producing localized impregnation of a gas permeable insulating blanket having two major surfaces with a plurality of edges joining the major surfaces comprising: a. enclosing the blanket except for a surface of one of the edges in a gas impermeable enclosure; b. applying an impregnate over the exposed surface of the edge; c. creating a partial vacuum within the enclosure to draw the impregnate into a portion of the blanket adjacent the edge; d. repeating steps (a), (b) and (c) for at least one other edge of the blanket; e. applying additional impregnate to a portion of one of the edges, and f. creating a partial vacuum within an isolated portion of the enclosure inward of a specific region which includes said portion to draw the additional impregnate into the specific region.
Claim 7
Dependent Claim
35 words
A method as defined in claim 4 wherein: a. the degree of penetration of the impregnate into the blanket is controlled by the degree of the vacuum created and the time the vacuum is applied.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |