Patent US1704904A successfully refreshed from Google Patents.
US1704904A
Expired / Lapsed
US
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Two-flame arc lamp
Assignee: Individual
•
Filing: 1920-08-14
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Granted: 1929-03-12
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Expires: 1940-08-14
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Schaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:39
CPC Classifications
H; H05; H05B; H05B31/00; H05B31/003; H05B31/0036; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49348; Y10T74/00; Y10T74/15; Y10T74/1503; Y10T74/1508; Y10T74/19; Y10T74/19614; Y10T74/19619
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) | 1932-03-11 | 1932-09-10 | 1933-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-03-11 | 1936-09-10 | 1937-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-03-11 | 1940-09-10 | 1941-03-12 | $7700.00 | Window Closed / Lapsed |