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Patent US2819380A successfully refreshed from Google Patents.
US2819380A
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Method and apparatus for making apertured masks
Assignee: Allen B du Mont Laboratories Inc
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Filing: 1953-03-23
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Granted: 1958-01-07
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Expires: 1973-03-23
Abstract
No abstract record available.
Inventors
- 👤 Roland D Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; H01J37/00; H01J37/30; H01J37/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1594061A
Cited
US2267752A
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US2267714A
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US2261154A
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US2345080A
Cited
US2549596A
Cited
US2515267A
Cited
US2565768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |