US2768424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a thermopile
Assignee: AO Smith Corp
•
Filing: 1953-04-20
•
Granted: 1956-10-30
•
Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Orrin E Andrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
H; H10; H10N; H10N10/00; H10N10/01; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49087; Y10T29/49089; Y10T29/49091
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US781288A
Cited
US1227346A
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GB144757A
Cited
US1664720A
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US1669385A
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US2310026A
Cited
US2605296A
Cited
US2632833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |