US2063945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm and method
Assignee: Individual
•
Filing: 1933-08-02
•
Granted: 1936-12-15
•
Expires: 1953-08-02
Abstract
No abstract record available.
Inventors
- 👤 Pierce George Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
G; G10; G10K; G10K13/00; G01; G01H; G01H3/00; G01H3/10; H; H04; H04R; H04R2440/00; H04R2440/01; H04R7/00; H04R7/02; H04R7/04; H04R7/045
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) | 1939-12-15 | 1940-06-15 | 1940-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-12-15 | 1944-06-15 | 1944-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-12-15 | 1948-06-15 | 1948-12-15 | $7700.00 | Window Closed / Lapsed |