Patent US4497123A successfully refreshed from Google Patents.
Patent US2641830A successfully refreshed from Google Patents.
US2641830A
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US
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Method of making corrugated tubes
Assignee: Chicago Pump Co
•
Filing: 1948-11-02
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Granted: 1953-06-16
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Expires: 1968-11-02
Abstract
No abstract record available.
Inventors
- 👤 Miles A Lamb
- 👤 Joseph J Klein
- 👤 William C Stranberg
- 👤 Julius H Frankowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:56
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/10; B21C37/104; B21D; B21D15/00; B21D15/02
Claims Analysis
Total Claims: 0
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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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |