US1906453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: WARREN E COLLINS
•
Filing: 1931-11-25
•
Granted: 1933-05-02
•
Expires: 1951-11-25
Abstract
No abstract record available.
Inventors
- 👤 Drinker Philip
- 👤 Shaw Louis Agassiz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:36
CPC Classifications
A; A61; A61H; A61H31/00; A61H31/02
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) | 1936-05-01 | 1936-10-31 | 1937-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-05-01 | 1940-10-31 | 1941-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-05-01 | 1944-10-31 | 1945-05-02 | $7700.00 | Window Closed / Lapsed |