Patent US1036863A successfully refreshed from Google Patents.
Patent US2970814A successfully refreshed from Google Patents.
US2970814A
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Refrigerant heat transfer element
Assignee: Sundstrand Heat Transfer Inc
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Filing: 1957-02-19
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Granted: 1961-02-07
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Expires: 1977-02-19
Abstract
No abstract record available.
Inventors
- 👤 Edward D Floreen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:20
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49359
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US197600A
Cited
US877252A
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GB452231A
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US2475187A
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US2540339A
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US2505619A
Cited
US2602650A
Cited
US2667762A
Cited
GB747402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |