Patent US2681944A successfully refreshed from Google Patents.
US2681944A
Expired / Lapsed
US
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Electrical resistance
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1952-01-15
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Granted: 1954-06-22
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Expires: 1972-01-15
Abstract
No abstract record available.
Inventors
- 👤 Rd George E Comstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:41
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/02; H05B3/06; F; F27; F27D; F27D11/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
AN ELECTRICAL RESISTANCE COMPRISING A ROD OF ZIRCONIA AND A PAIR OF ENDS THEREFOR MADE OF OXIDE SELECTED FROM THE GROUP CONSISTING OF THORIUM DIOXIDE, CERIC OXIDE AND MIXTURES THEREOF AND ZINC OXIDE.
Claim 2
Dependent Claim
33 words
AN ELECTRICAL RESISTANCE COMPRISING A ROD OF ZIRCONIA AND A PAIR OF ENDS THEREFOR MADE OF OXIDE SELECTED FROM THE GROUP CONSISTING OF THORIUM DIOXIDE, CERIC OXIDE AND MIXTURES THEREOF AND ZINC OXIDE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |