US2642061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air line respirator filter cartridge holder
Assignee: Willson Products Inc
•
Filing: 1951-10-26
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Granted: 1953-06-16
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Expires: 1971-10-26
Abstract
No abstract record available.
Inventors
- 👤 Charles J Boyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:59
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; Y; Y10; Y10S; Y10S55/00; Y10S55/35
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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |