US2815302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film resistors
Assignee: Commonwealth Engineering Company of Ohio
•
Filing: 1954-03-12
•
Granted: 1957-12-03
•
Expires: 1974-03-12
Abstract
No abstract record available.
Inventors
- 👤 Ostrofsky Bernard
- 👤 James W Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:07
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/20; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
61 words
A PROCESS FOR PRODUCING ELECTRICAL RESISTORS WHICH COMPRISES PROVIDING A GLASS BASE, DEPOSITING FROM CHROMIUM HEXACARBONYL A TIN FILM OF CHROMIUM OF THE BASE IN AN EVACUATED AND NON-OXIDING ATMOSPHERE, AND HEAT-ING THE CHROMIUM AND BASE IN THE EVACUATED ATMOSPHERE TO SUBSTANTIALLY RED HEAT TO IMPROVE THE TEMPERATURE COEFFICIENT OF RESISTANCE AND THE ADHESION OF THE DEPOSITEDD FILM TO THE GLASS.
References Cited (Backward Citations)
US2733325A
Cited
US1739256A
Cited
US1991774A
Cited
US1964322A
Cited
US2118795A
Cited
US2047350A
Cited
US2047351A
Cited
US2357473A
Cited
US2522531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |