Patent US2691827A successfully refreshed from Google Patents.
US575668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminant for incandescent lamps
Assignee: —
•
Filing: —
•
Granted: 1897-01-19
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Expires: 1914-01-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:13
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; C; C23; C23C; C23C4/00; C23C4/04; C23C4/06; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/938; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49986; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12861; Y10T428/12875
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) | 1900-01-19 | 1900-07-21 | 1901-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1904-01-20 | 1904-07-21 | 1905-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1908-01-20 | 1908-07-21 | 1909-01-20 | $7700.00 | Window Closed / Lapsed |