US1420181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic electric heating device for glass furnaces
Assignee: Individual
•
Filing: 1920-03-29
•
Granted: 1922-06-20
•
Expires: 1940-03-29
Abstract
No abstract record available.
Inventors
- 👤 Walter G Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:26
CPC Classifications
C; C03; C03B; C03B15/00; C03B15/02; Y; Y10; Y10S; Y10S65/00; Y10S65/04
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) | 1925-06-19 | 1925-12-19 | 1926-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1929-06-19 | 1929-12-19 | 1930-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1933-06-19 | 1933-12-19 | 1934-06-20 | $7700.00 | Window Closed / Lapsed |