Patent US503753A successfully refreshed from Google Patents.
US503753A
Expired / Lapsed
US
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Diving apparatus
Assignee: —
•
Filing: —
•
Granted: 1893-08-22
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Expires: 1910-08-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:00
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/34; B63C11/44
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) | 1896-08-21 | 1897-02-20 | 1897-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1900-08-22 | 1901-02-21 | 1901-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1904-08-22 | 1905-02-21 | 1905-08-23 | $7700.00 | Window Closed / Lapsed |