US2639772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet tearing device
Assignee: Waldorf Paper Products Co
•
Filing: 1949-02-04
•
Granted: 1953-05-26
•
Expires: 1969-02-04
Abstract
No abstract record available.
Inventors
- 👤 Nels H Sandberg
- 👤 Henry O Ronning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:34
CPC Classifications
B; B26; B26F; B26F3/00; B26F3/002; B26D; B26D7/00; B26D7/27; B26D7/32; B26D2007/322; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/329; Y10T225/35; Y10T83/00; Y10T83/202; Y10T83/2033; Y10T83/2037; Y10T83/2042; Y10T83/647; Y10T83/6476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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DE498979C
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US1680044A
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US1967545A
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US2191497A
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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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |