US2920005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical resistors
Assignee: Welwyn Electrcal Laboratories Ltd
•
Filing: 1956-12-03
•
Granted: 1960-01-05
•
Expires: 1976-12-03
Abstract
No abstract record available.
Inventors
- 👤 Dearden Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:40
CPC Classifications
H; H01; H01C; H01C7/00; C; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; H01B; H01B1/00; H01B1/06; H01B1/08; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
AN ELECTRICAL RESISTOR COMPRISING A NON-CONDUCTING VITREOUS BODY AND AN ELECTRICALLY CONDUCTIVE COATING THEREON OF TIN, ANTIMONY AND BORON OXIDES, THE AMOUNT OF ANTIMONY EXPRESSED AS ANTIMONY PENTOXIDE BEING FROM ABOUT 1.5 TO 10% AND THE AMOUNT OF BORON EXPRESSED AS BORIC OXIDE BEING FROM ABOUT 0.05 TO 2.5%, BOTH PERCENTAGES BEING BASED ON THE TOTAL WEIGHT OF THE ELECTRICALLY CONDUCTIVE COATING, SAID COATING BEING IN THE FORM OF A FLIM OF WHICH THE SURFACE RESISTIVITY IS 1 OHM TO 10,000 OHMS PER SQUARE CENTIMETRE.
Claim 2
Dependent Claim
85 words
AN ELECTRICAL RESISTOR COMPRISING A NON-CONDUCTING VITREOUS BODY AND AN ELECTRICALLY CONDUCTIVE COATING THEREON OF TIN, ANTIMONY AND BORON OXIDES, THE AMOUNT OF ANTIMONY EXPRESSED AS ANTIMONY PENTOXIDE BEING FROM ABOUT 1.5 TO 10% AND THE AMOUNT OF BORON EXPRESSED AS BORIC OXIDE BEING FROM ABOUT 0.05 TO 2.5%, BOTH PERCENTAGES BEING BASED ON THE TOTAL WEIGHT OF THE ELECTRICALLY CONDUCTIVE COATING, SAID COATING BEING IN THE FORM OF A FLIM OF WHICH THE SURFACE RESISTIVITY IS 1 OHM TO 10,000 OHMS PER SQUARE CENTIMETRE.
References Cited (Backward Citations)
US2118795A
Cited
US2440691A
Cited
US2564706A
Cited
US2564707A
Cited
US2564677A
Cited
US2624823A
Cited
US2671735A
Cited
US2717946A
Cited
US2617741A
Cited
US2720471A
Cited
US2818354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |