Patent US2320498A successfully refreshed from Google Patents.
US2320498A
Expired / Lapsed
US
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Process of making metal coated collapsible tubes
Assignee: NL Industries Inc
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Filing: 1940-04-09
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Granted: 1943-06-01
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Expires: 1960-04-09
Abstract
No abstract record available.
Inventors
- 👤 Alexander W Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:25
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/36; B21C; B21C23/00; B21C23/22; Y; Y10; Y10S; Y10S29/00; Y10S29/047; Y10S72/00; Y10S72/70
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) | 1946-05-31 | 1946-11-30 | 1947-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-31 | 1950-11-30 | 1951-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-31 | 1954-11-30 | 1955-06-01 | $7700.00 | Window Closed / Lapsed |