Patent US2367389A successfully refreshed from Google Patents.
Patent US3695847A successfully refreshed from Google Patents.
US3695847A
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Hydrocarbon detector
Assignee: Bio Rad Laboratories Inc
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Filing: 1971-11-15
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Granted: 1972-10-03
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Expires: 1991-11-15
Abstract
Abstract METHOD OF DETECTING THE VAPORS OF AROMATIC AND UNSATURATED HYDROCARBON BY REACTING THE VAPOR WITH A FILM OF POLYTETRAFLUORETHYLENE SULFONIC ACID, AND EXAMINING THE ULTRAVIOLET TRANSMISSION CHARACTERISTICS OF THE REACTED FILM.
Inventors
- 👤 Tomas Hirschfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1451; Y; Y10; Y10T; Y10T436/00; Y10T436/21; Y10T436/214; Y10T436/216
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |