Patent US3405760A successfully refreshed from Google Patents.
US3405760A
Expired / Lapsed
US
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Heat exchange apparatus and method of making same
Assignee: SPX Technologies Inc
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Filing: 1966-03-17
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Granted: 1968-10-15
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Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Robert L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:22
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/008; F16; F16D; F16D3/00; F16D3/50; F16D3/78; F16D3/79
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US547801A
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US1692964A
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US2341981A
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US2449012A
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US2553142A
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US2646972A
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US2846857A
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US3235002A
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US3250321A
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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) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |