US3139754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic vacuum gauge
Assignee: GTE Sylvania Inc
•
Filing: 1961-06-15
•
Granted: 1964-07-07
•
Expires: 1981-06-15
Abstract
No abstract record available.
Inventors
- 👤 Burnell V Dore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:41
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A VACUUM GAUGE HAVING A SENSING HEAD COMPRISING A METALLIC SUBSTRATE, A SEMICONDUCTOR LAYER INTIMATELY BONDED TO A SURFACE OF THE SUBSTRATE AND CONSISTING OF AN OXIDE OF SAID SUBSTRATE, AND A METALLIC LAYER INTIMATELY BONDED TO SAID SEMICONDUCTOR LAYER; MEANS FOR APPLYING A BIAS VOLTAGE TO SAID SUBSTRATE AND TO SAID METALLIC LAYER, AND MEANS RESPONSIVE TO CURRENT FLOWING THROUGH THE SENSING HEAD FOR INDICATING AMBIENT PRESSURE; SAID HEAD AND SAID BIAS VOLTAGE MEANS AND SAID CURRENT RESPONSIVE MEANS BEING CONNECTED TOGETHER IN ELECTRICAL SERIES.
Claim 2
Dependent Claim
86 words
A VACUUM GAUGE HAVING A SENSING HEAD COMPRISING A METALLIC SUBSTRATE, A SEMICONDUCTOR LAYER INTIMATELY BONDED TO A SURFACE OF THE SUBSTRATE AND CONSISTING OF AN OXIDE OF SAID SUBSTRATE, AND A METALLIC LAYER INTIMATELY BONDED TO SAID SEMICONDUCTOR LAYER; MEANS FOR APPLYING A BIAS VOLTAGE TO SAID SUBSTRATE AND TO SAID METALLIC LAYER, AND MEANS RESPONSIVE TO CURRENT FLOWING THROUGH THE SENSING HEAD FOR INDICATING AMBIENT PRESSURE; SAID HEAD AND SAID BIAS VOLTAGE MEANS AND SAID CURRENT RESPONSIVE MEANS BEING CONNECTED TOGETHER IN ELECTRICAL SERIES.
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |