Patent US3419937A successfully refreshed from Google Patents.
US3419937A
Expired / Lapsed
US
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Filter and method and apparatus for its production
Assignee: Corning Glass Works
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Filing: 1967-06-15
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Granted: 1969-01-07
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Expires: 1987-06-15
Abstract
No abstract record available.
Inventors
- 👤 Alexander O Bally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:00
CPC Classifications
B; B31; B31D; B31D5/00; B31D5/0082; B01; B01D; B01D25/00; B01D25/001; B01D25/22; B01D25/24
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) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |