Patent US740742A successfully refreshed from Google Patents.
Patent US984915A successfully refreshed from Google Patents.
US984915A
Expired / Lapsed
US
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Diaphragm construction.
Assignee: Individual
•
Filing: 1910-05-19
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Granted: 1911-02-21
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Expires: 1930-05-19
Abstract
No abstract record available.
Inventors
- 👤 William S Heltzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:41
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/411; H01M50/429; H01M50/4295; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10S; Y10S264/00; Y10S264/57
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) | 1914-02-20 | 1914-08-22 | 1915-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-02-20 | 1918-08-22 | 1919-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-02-20 | 1922-08-22 | 1923-02-21 | $7700.00 | Window Closed / Lapsed |