Patent US2452639A successfully refreshed from Google Patents.
US2452639A
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Machine for producing a vent in cartridge cases
Assignee: Arenco AB
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Filing: 1944-09-21
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Granted: 1948-11-02
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Expires: 1964-09-21
Abstract
No abstract record available.
Inventors
- 👤 Ekstrom Gunnar
- 👤 Orstrom Gustaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:18
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/54; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2122; Y10T83/22; Y10T83/2203; Y10T83/384; Y10T83/387; Y10T83/388; Y10T83/395; Y10T83/727; Y10T83/748; Y10T83/7593; Y10T83/7667; Y10T83/869; Y10T83/8719; Y10T83/8752
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US94744A
Cited
US177067A
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US202363A
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US273734A
Cited
US1136162A
Cited
US2069291A
Cited
US2339773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |