US2743196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing reduced glass resistance elements
Assignee: Sprague Electric Co
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Filing: 1951-12-28
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Granted: 1956-04-24
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:13
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/06; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/263; C03C2218/00; C03C2218/10; C03C2218/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS OF PRODUCING ELETRICALLY CONDUCTIVE PARTICLES, COMPRISING, SUSPENDING BY A STREAM A REDUCING GAS A BED OF PARTICLES SMALL ENOUGH TO PASS THROUGH A 40-MESH SCREEN, AND CONSISTING ESSENTIALLY OF PREPARED GLASS CONTAINING A REDUCIBLE HEAVY METAL OXIDE SAID GAS BEING HEATED TO A TEMPERATURE SUFFICIENT TO REDUCE THE SURFACES OF SAID PARTICLES TO ELECTRICALLY CONDUCTIVE FILMS.
Claim 2
Dependent Claim
58 words
A PROCESS OF PRODUCING ELETRICALLY CONDUCTIVE PARTICLES, COMPRISING, SUSPENDING BY A STREAM A REDUCING GAS A BED OF PARTICLES SMALL ENOUGH TO PASS THROUGH A 40-MESH SCREEN, AND CONSISTING ESSENTIALLY OF PREPARED GLASS CONTAINING A REDUCIBLE HEAVY METAL OXIDE SAID GAS BEING HEATED TO A TEMPERATURE SUFFICIENT TO REDUCE THE SURFACES OF SAID PARTICLES TO ELECTRICALLY CONDUCTIVE FILMS.
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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |