US2652828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: Willson Products Inc
•
Filing: 1951-03-26
•
Granted: 1953-09-22
•
Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 James N Matheson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:04
CPC Classifications
A; A62; A62B; A62B18/00; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1213760A
Cited
US2019928A
Cited
FR831319A
Cited
FR853770A
Cited
US2326382A
Cited
US2371965A
Cited
US2578621A
Cited
US2462005A
Cited
US2505173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |