US2507094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for making spiral heat exchangers
Assignee: Stewart Warner Corp
•
Filing: 1944-09-08
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Granted: 1950-05-09
•
Expires: 1964-09-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Collins
- 👤 John H Leslie
- 👤 Charles T Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:27
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/027; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49805; Y10T29/49826; Y10T29/49881
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2193345A
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US2129300A
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US2281299A
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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) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |