US2623443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of helically wound tubes
Assignee: Individual
•
Filing: 1948-02-28
•
Granted: 1952-12-30
•
Expires: 1968-02-28
Abstract
No abstract record available.
Inventors
- 👤 Robinson Ernest Bradbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
B; B31; B31C; B31C3/00; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4653; Y10T83/4656; Y10T83/4664; Y10T83/4766; Y10T83/4789
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2249820A
Cited
US1549429A
Cited
US1625470A
Cited
US1698250A
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US1929267A
Cited
US2062303A
Cited
US2199708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |