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US3456319A
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Method of making multifin helical fin tubes
Assignee: Individual
•
Filing: 1967-01-23
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Granted: 1969-07-22
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Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 John R Gier Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:38
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; F28F1/40; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49881
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2430081A
Cited
US2440698A
Cited
US2752953A
Cited
US2956335A
Cited
US2945296A
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US3112558A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |