US3483427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens for electron beam recorder
Assignee: 3M Co
•
Filing: 1967-11-03
•
Granted: 1969-12-09
•
Expires: 1987-11-03
Abstract
No abstract record available.
Inventors
- 👤 Robert S Berglund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/06; H01J31/065; H01J29/00; H01J29/46; H01J29/56; H01J29/58; H01J29/64; H01J29/66
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2422807A
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US2464419A
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US2464396A
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US2781171A
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US2627589A
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US2640950A
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US3358174A
Cited
US3418520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-08 | 1973-06-09 | 1973-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-08 | 1977-06-09 | 1977-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-08 | 1981-06-09 | 1981-12-09 | $7700.00 | Window Closed / Lapsed |