Patent US3774648A successfully refreshed from Google Patents.
US3774648A
Expired / Lapsed
US
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Porous plastic structures having apertures
Assignee: MICRO-POR Inc
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Filing: 1970-09-25
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Granted: 1973-11-27
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Expires: 1990-09-25
Abstract
Abstract Molding powder of a polymeric resin having intrinsic acid properties, such as acrylonitrile - butadiene - styrene terpolymer, is admixed with a decomposable chemical compound to produce a resulting mixture which is then extruded to form an extrudate. The extrudate is passed through a reduced pressure cooling zone while still in a semi-molten state to remove the gaseous components of the decomposed chemical compound. Upon removing the solidified extrudate from the reduced pressure cooling zone a porous article is produced immediately and without further processing.
Inventors
- 👤 F Edlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C67/00; B29C67/20; B29C67/202; B29K; B29K2027/00; B29K2027/06; B29K2033/00; B29K2055/00; B29K2055/02; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
58 words
The porous article according to claim 1 wherein said article is a conduit formed of a mixture of acrylonitrile-butadiene-styrene polymer and from about 0.5 to 25 weight percent sodium bicarbonate, said conduit having about 6,000 to 25,000 aperatures per square inch therein, and each of said aperatures having a diameter in the range of 0.3 to 5 microns.
Claim 2
Dependent Claim
26 words
The porous article according to claim 2 wherein said aperatures in said conduit have a diameter in the range of from about 2 to 4 microns.
Claim 3
Dependent Claim
57 words
The porous article of claim 1 wherein said article is a sheet formed of a mixture of acrylonitrile-butadiene-styrene polymar and from about 0.5 to 25 weight percent sodium bicarbonate, said sheet having about 6,000 to 150,000 apertures per square inch therein and each of said apertures having a diameter in the range of 0.3 to 5 microns.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |