US3695848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detecting device
Assignee: Individual
•
Filing: 1970-04-07
•
Granted: 1972-10-03
•
Expires: 1990-04-07
Abstract
Abstract A GAS DETECTING DEVICE FOR DETECTING INFLAMMABLE GASES WHICH INCLUDES A SEMICONDUCTOR MATERIAL, MEANS FOR PASSING A CURRENT THROUGH THE SEMICONDUCTOR MATERIAL TO DETERMINE CHANGES IN RESISTIVITY CAUSED BY THE PRESENCE OF THE INFLAMMABLE GAS, AND HEATING MEANS FOR HEATING THE SEMICONDUCTOR MATERIAL TO OBTAIN AN OPTIMUM SENSITITIVITY CHARACTERISTIC.
Inventors
- 👤 Naoyoshi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12
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 |