US2787333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and gas mask canister employing same
Assignee: Individual
•
Filing: 1954-07-13
•
Granted: 1957-04-02
•
Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 Harris D Boone
- 👤 Miles O Howell
- 👤 Robert E Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:11
CPC Classifications
A; A62; A62B; A62B23/00; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |