US1829237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater element and method of making it
Assignee: RUBEN TUBE Co
•
Filing: 1928-10-11
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Granted: 1931-10-27
•
Expires: 1948-10-11
Abstract
No abstract record available.
Inventors
- 👤 Ruben Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:18
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/08; C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H01B3/10; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/00525
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) | 1934-10-26 | 1935-04-27 | 1935-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-26 | 1939-04-27 | 1939-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-26 | 1943-04-27 | 1943-10-27 | $7700.00 | Window Closed / Lapsed |