US4145506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packing materials for gas separation columns
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1977-11-04
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Granted: 1979-03-20
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Expires: 1997-11-04
Abstract
Abstract Packing materials for gas chromatography columns are disclosed. The columns can be used to separate polar compounds with low boiling points. The packing materials, which consist mainly of particulate RSiO3/2 resin, where R is alkyl, aryl or alkenyl, have excellent separation efficiencies.
Inventors
- 👤 Yokichi Yamamoto
- 👤 Yoshinari Ohwaku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:16
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; C; C08; C08G; C08G77/00; C08G77/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A gas chromatography column containing a packing material which consists essentially of particulate RSiO 3/2 resin or particulate resins consisting of RSiO 3/2 and minor amounts of other siloxane units selected from R 2 SiO, R 3 SiO 1/2 and SiO 4/2 or mixtures thereof wherein R is an alkyl group, aryl group, alkenyl group or mixtures thereof, wherein the particle size of the packing material has a mean particle size of from 50-150 mesh as measured by the Tyler Standard Mesh.
Claim 2
Dependent Claim
82 words
A gas chromatography column containing a packing material which consists essentially of particulate RSiO 3/2 resin or particulate resins consisting of RSiO 3/2 and minor amounts of other siloxane units selected from R 2 SiO, R 3 SiO 1/2 and SiO 4/2 or mixtures thereof wherein R is an alkyl group, aryl group, alkenyl group or mixtures thereof, wherein the particle size of the packing material has a mean particle size of from 50-150 mesh as measured by the Tyler Standard Mesh.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |