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US2939356A
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Apparatus for perforating sheets
Assignee: SWANEE PAPER Corp
•
Filing: 1956-04-20
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Granted: 1960-06-07
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Expires: 1976-04-20
Abstract
No abstract record available.
Inventors
- 👤 Glen M Tracy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:03
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/18; B26F1/20; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/4812; Y10T83/483; Y10T83/4838; Y10T83/4844; Y10T83/869; Y10T83/8776; Y10T83/8782; Y10T83/8784
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2018366A
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US2186679A
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US2704577A
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US2757442A
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US2850093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |