Patent US2867929A successfully refreshed from Google Patents.
US2867929A
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Method and apparatus for chemically boring metallic material
Assignee: General Dynamics Corp
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Filing: 1956-12-20
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Granted: 1959-01-13
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Expires: 1976-12-20
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Monahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:43
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/04; C23F1/08
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) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |