Patent USRE29410E successfully refreshed from Google Patents.
USRE29410E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing of deodorizing air filters
Assignee: Weinberger C and Co Ltd
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Filing: 1975-09-05
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Granted: 1977-09-20
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Expires: 1995-09-05
Abstract
Abstract Process for manufacturing a deodorizing gas filter which comprises dissolving polyvinyl alcohol in water; adding to said solution at least one substance which is an amphoteric ion exchange resin, activated carbon or coconut shell charcoal, thereby forming a pasty mass; adding to said pasty mass glyoxal, in an amount in excess of that which would be sufficient to acetalize the polyvinyl alcohol, and a small amount of acid for the acetal formation; impregnating the resulting composition into a non-woven textile fabric gas filter; and heating said impregnated filter at about 70°-100° C for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinyl acetal.
Inventors
- 👤 Toshio Yoshino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:54
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; A; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; B01D53/00; B01D53/02; B01J; B01J47/00; B01J47/018; B01D2239/00; B01D2239/04; B01D2239/0407; B01D2239/0414; B01D2239/0421; B01D2239/045; B01D2239/0464
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
Process for manufacturing a deodorizing gas filter which comprises dissolving polyvinyl alcohol in water; adding to said solution at least one substance which is an amphoteric ion exchange resin, activated carbon or coconut shell charcoal, thereby forming a pasty mass; adding to said pasty mass glyoxal in the amount in excess of that which would be sufficient to acetalize the polyvinyl alcohol, and a small amount of acid for the acetal formation; impregnating the resulting composition into a non-woven textile fabric gas filter; and heating said impregnated filter at about 70°-100° C. for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinylacetal.
Claim 2
Dependent Claim
105 words
Process for manufacturing a deodorizing gas filter which comprises dissolving polyvinyl alcohol in water; adding to said solution at least one substance which is an amphoteric ion exchange resin, activated carbon or coconut shell charcoal, thereby forming a pasty mass; adding to said pasty mass glyoxal in the amount in excess of that which would be sufficient to acetalize the polyvinyl alcohol, and a small amount of acid for the acetal formation; impregnating the resulting composition into a non-woven textile fabric gas filter; and heating said impregnated filter at about 70°-100° C. for 30 minutes to 2 hours, thereby converting said polyvinyl alcohol to polyvinylacetal.
Claim 3
Dependent Claim
29 words
Process as claimed in claim 1 wherein .[.the fibers of said non-woven fabric.]. .Iadd.said gas filter is a non-woven textile fabric gas filter, the fibers of which .Iaddend.are nylon.
Claim 4
Dependent Claim
21 words
Process as claimed in claim 1 wherein said substance is an amphoteric ion exchange resin and wherein said composition is hydrophilic.
Claim 5
Dependent Claim
15 words
Process as claimed in claim 1 wherein said substance is an amphoteric ion exchange resin.
Claim 6
Dependent Claim
12 words
Process as claimed in claim 1 wherein said substance is activated carbon.
Claim 7
Dependent Claim
50 words
Process as claimed in claim 1 wherein said substance is coconut shell charcoal. .Iadd. 7. Process as claimed in claim 1, wherein said non-woven textile fabric gas filter utilizes the fibers of at least one of nylon, cotton or other conventional synthetic or natural materials including foamed resinous materials. .Iaddend.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |