US2648753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent conducting films
Assignee: PPG Industries Inc
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Filing: 1951-12-15
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Granted: 1953-08-11
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Expires: 1971-12-15
Abstract
No abstract record available.
Inventors
- 👤 William O Lytle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:39
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; H05B2203/00; H05B2203/016; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
AN ELECTRIC HEATING DEVICE WHICH COMPRISES A VITREOUS CERAMIC BODY HAVING ON A SURFACE THEREOF AN ELECTRICALLY CONDUCTING IRIDIZED METAL OXIDE FILM INTEGRALLY UNITED WITH SUCH SURFACE AND HAVING AN ELECTRICAL RESISTANCE OF LESS THAN 1000 OHMS PER SQUARE AND, SUPERPOSED ON SAID FILM AND INTEGRALLY UNITED THEREWITH, A SECOND IRIDIZED METAL OXIDE FILM HAVING A DIFFERENT COMPOSITION AND A HIGHER ELECTRICAL RESISTANCE THAN THE FIRST FILM, SAID BODY PROVIDED WITH SPACED METALLIC MEMBERS IN ELECTRICAL CONTACT WITH THE FILM INTEGRALLY UNITED WITH THE SURFACE OF SUCH BODY.
Claim 2
Dependent Claim
88 words
AN ELECTRIC HEATING DEVICE WHICH COMPRISES A VITREOUS CERAMIC BODY HAVING ON A SURFACE THEREOF AN ELECTRICALLY CONDUCTING IRIDIZED METAL OXIDE FILM INTEGRALLY UNITED WITH SUCH SURFACE AND HAVING AN ELECTRICAL RESISTANCE OF LESS THAN 1000 OHMS PER SQUARE AND, SUPERPOSED ON SAID FILM AND INTEGRALLY UNITED THEREWITH, A SECOND IRIDIZED METAL OXIDE FILM HAVING A DIFFERENT COMPOSITION AND A HIGHER ELECTRICAL RESISTANCE THAN THE FIRST FILM, SAID BODY PROVIDED WITH SPACED METALLIC MEMBERS IN ELECTRICAL CONTACT WITH THE FILM INTEGRALLY UNITED WITH THE SURFACE OF SUCH BODY.
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) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |