Patent US504890A successfully refreshed from Google Patents.
US504890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for reflecting and refracting radiant energy
Assignee: —
•
Filing: —
•
Granted: 1893-09-12
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Expires: 1910-09-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:13
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/0816; G02B26/0825; G02B3/00; G02B3/12; G02B3/14
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) | 1896-09-11 | 1897-03-13 | 1897-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1900-09-12 | 1901-03-14 | 1901-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1904-09-12 | 1905-03-14 | 1905-09-13 | $7700.00 | Window Closed / Lapsed |