US2348740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm and method of forming same
Assignee: Copeman Laboratories Co
•
Filing: 1938-01-29
•
Granted: 1944-05-16
•
Expires: 1958-01-29
Abstract
No abstract record available.
Inventors
- 👤 Harley Y Jennings
- 👤 Joseph A Gillen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:24
CPC Classifications
D; D06; D06B; D06B3/00; D06B3/10; D06B2700/00; D06B2700/28; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T442/00; Y10T442/20; Y10T442/2369
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) | 1947-05-16 | 1947-11-15 | 1948-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-05-16 | 1951-11-15 | 1952-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-05-16 | 1955-11-15 | 1956-05-16 | $7700.00 | Window Closed / Lapsed |