US2818490A
Expired / Lapsed
US
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Means for use in the working of metals by electro-erosion
Assignee: Firth Sterling Inc
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Filing: 1953-08-10
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Granted: 1957-12-31
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Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Reginald J Dixon
- 👤 William H Bateman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:14
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; B; B23; B23H; B23H1/00; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C23F11/1673; D; D06; D06L; D06L1/00; D06L1/02; D06L1/04; C10; C10M; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/042; C10N; C10N2010/00; C10N2010/08; C10N2030/00; C10N2030/12; Y; Y10; Y10S; Y10S408/00; Y10S408/703; Y10T; Y10T408/00; Y10T408/44; Y10T408/45; Y10T408/455; Y10T408/55; Y10T408/566
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-30 | 1961-07-01 | 1961-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-30 | 1965-07-01 | 1965-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-30 | 1969-07-01 | 1969-12-31 | $7700.00 | Window Closed / Lapsed |