US2621903A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange tubing
Assignee: Individual
•
Filing: 1949-07-02
•
Granted: 1952-12-16
•
Expires: 1969-07-02
Abstract
No abstract record available.
Inventors
- 👤 Irving H Cohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:44
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/0008; Y; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE152795C
Cited
GB191218212A
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GB275028A
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US1799706A
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US2032413A
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US2297146A
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US2297165A
Cited
CH236648A
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US2443295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |