US3404254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for engraving a generally cross-sectionally circular shaped body by a corpuscular beam
Assignee: 3M Co
•
Filing: 1965-02-26
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Granted: 1968-10-01
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Expires: 1985-02-26
Abstract
No abstract record available.
Inventors
- 👤 Derrick A Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
B; B23; B23K; B23K15/00; B23K15/02; H; H01; H01J; H01J37/00; H01J37/30; H01J37/302; H01J37/3023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2925463A
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US2870250A
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US3246079A
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US3192318A
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US3259730A
Cited
US3308264A
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US3301949A
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US3293587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |