Patent US3495775A successfully refreshed from Google Patents.
Patent US1397080A successfully refreshed from Google Patents.
US1397080A
Expired / Lapsed
US
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Boiler-tube and end-plate connection
Assignee: Individual
•
Filing: 1918-01-15
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Granted: 1921-11-15
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Expires: 1938-01-15
Abstract
No abstract record available.
Inventors
- 👤 Charles S Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
F; F16; F16L; F16L41/00; F16L41/001; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-11-14 | 1925-05-16 | 1925-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-11-14 | 1929-05-16 | 1929-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-11-14 | 1933-05-16 | 1933-11-15 | $7700.00 | Window Closed / Lapsed |