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US2881950A
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Assignee: National Machinery Co
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Filing: 1955-06-06
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Granted: 1959-04-14
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Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Robert G Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:33
CPC Classifications
B; B23; B23Q; B23Q7/00; B23Q7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309998A
Cited
US1294993A
Cited
US2068075A
Cited
US1975445A
Cited
US2026823A
Cited
US2584465A
Cited
US2728318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |