US2091764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure dampener
Assignee: Martin Decker Corp
•
Filing: 1936-03-17
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Granted: 1937-08-31
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Expires: 1956-03-17
Abstract
No abstract record available.
Inventors
- 👤 Walter R Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08; E21B34/00; E21B34/02; E21B34/025
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) | 1940-08-30 | 1941-03-01 | 1941-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-30 | 1945-03-01 | 1945-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-30 | 1949-03-01 | 1949-08-31 | $7700.00 | Window Closed / Lapsed |