US2945936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark-machining
Assignee: Birmingham Small Arms Co Ltd
•
Filing: 1957-03-01
•
Granted: 1960-07-19
•
Expires: 1977-03-01
Abstract
No abstract record available.
Inventors
- 👤 Carman Eric Hewstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:32
CPC Classifications
B; B23; B23H; B23H1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US650124A
Cited
US1492167A
Cited
GB279886A
Cited
GB319487A
Cited
US2490302A
Cited
US2640136A
Cited
US2592894A
Cited
US2650979A
Cited
US2715172A
Cited
US2773968A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |