Patent US2228162A successfully refreshed from Google Patents.
US2228162A
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US
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Machine for perforating plasterboard
Assignee: JB Ehrsam and Sons Manufacturing Co
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Filing: 1938-09-28
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Granted: 1941-01-07
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Expires: 1958-09-28
Abstract
No abstract record available.
Inventors
- 👤 Emmett D Benham
- 👤 John R Rosenleaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:07
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/14; B28B11/16; B28B11/163; B28B11/12; Y; Y10; Y10T; Y10T83/00; Y10T83/465; Y10T83/4653; Y10T83/4656; Y10T83/4667; Y10T83/467; Y10T83/4696; Y10T83/4705; Y10T83/4737; Y10T83/4757
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) | 1944-01-07 | 1944-07-08 | 1945-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-01-07 | 1948-07-08 | 1949-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-01-07 | 1952-07-08 | 1953-01-07 | $7700.00 | Window Closed / Lapsed |