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Patent US3423261A successfully refreshed from Google Patents.
US3423261A
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Method of etching fine filamentary apertures in thin metal sheets
Assignee: Buckbee Mears Co
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Filing: 1965-03-08
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Granted: 1969-01-21
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Expires: 1985-03-08
Abstract
No abstract record available.
Inventors
- 👤 John J Frantzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:51
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12201; Y10T428/12361
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2469689A
Cited
US2649361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |