Patent US4830643A successfully refreshed from Google Patents.
US4830643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded polytetrafluoroethylene tubular container
Assignee: W.L. Gore and Associates Inc
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Filing: 1988-07-13
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Granted: 1989-05-16
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Expires: 2008-07-13
Abstract
Abstract A container for adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene sealed at both ends, so as to encapsulate an adsorbent present with the tubular structure.
Inventors
- 👤 Robert L. Sassa
- 👤 Christian E. Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:18
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/261; B01D53/02; B01D53/04; B01D53/0407; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/104; B01D2253/106; B01D2253/108; B01D2253/20; B01D2253/202; B01D2253/30; B01D2253/302; B01D2253/304; B01D2253/308; B01D2257/00; B01D2257/70; B01D2257/80
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
A container for selectively adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene, said tubular structure being sealed at both ends so as to encapsulate an adsorbent present within the tubular structure, the pores of said polytetrafluoroethylene having an average size of between about 0.1 and 1 micron, with substantially no pores greater than 5 micron in size.
Claim 2
Dependent Claim
64 words
A container for selectively adsorbing components present in an environment, which comprises a tubular structure of expanded, porous polytetrafluoroethylene, said tubular structure being sealed at both ends so as to encapsulate an adsorbent present within the tubular structure, the pores of said polytetrafluoroethylene having an average size of between about 0.1 and 1 micron, with substantially no pores greater than 5 micron in size.
Claim 3
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is calcium sulfate.
Claim 4
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is activated carbon.
Claim 5
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is silica gel.
Claim 6
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is calcium carbonate.
Claim 7
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is activated alumina.
Claim 8
Dependent Claim
11 words
The container of claim 1 wherein the adsorbent is molecular sieves.
Claim 9
Dependent Claim
16 words
The container of claim 1 wherein the ends of the tube are sealed with an adhesive.
Claim 10
Dependent Claim
16 words
The contain of claim 1 wherein the adsorbent is sealed by fusion of PTFE to PTFE.
Claim 11
Dependent Claim
16 words
The container of claim 1 wherein the average wall thickness is between 10 and 50 mils.
Claim 12
Dependent Claim
17 words
The container of claim 10 wherein the length of the container is between 0.25 and 20 inches.
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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |