US1386722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm
Assignee: AT&T Inc
•
Filing: 1919-06-24
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Granted: 1921-08-09
•
Expires: 1939-06-24
Abstract
No abstract record available.
Inventors
- 👤 George E Mather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:48
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C43/00; B29C43/02; B29C43/14; B29C43/146; B29C70/68; B29C70/70; B29C2043/148; B29K; B29K2021/00; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/20; B29L; B29L2031/00; B29L2031/755; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1026
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) | 1924-08-08 | 1925-02-07 | 1925-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-08-08 | 1929-02-07 | 1929-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-08-08 | 1933-02-07 | 1933-08-09 | $7700.00 | Window Closed / Lapsed |