US3585129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual thickness tlc plates and device therefor
Assignee: United States Department of Agriculture
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Filing: 1969-03-28
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Granted: 1971-06-15
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Expires: 1989-03-28
Abstract
Abstract IMPROVED TLC RESOLUTIONS ARE OBTAINED ON PLATES ON WHICH THE THICKNESS OF THE CONTINUOUS ADSORBENT LAYER IS ABRUPTLY INCREASED BY A FACTOR OF ABOUT FOUR OR FIVE TO PRIVIDE A NARROW, DEEPLY COATED ZONE THAT INCREASES THE UPTAKE OF SOLVENT. A SPREADER FOR READILY PREPARING THE DUAL THICKNESS PLATES ALSO IS DESCRIBED.
Inventors
- 👤 Norman E Delfel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:08
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/29; B28B19/00; G; G01; G01N; G01N30/00; G01N30/90; G01N30/92; G01N30/93; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24752; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 0
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |