US2220028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling temperature of furnaces
Assignee: Individual
•
Filing: 1936-08-26
•
Granted: 1940-10-29
•
Expires: 1956-08-26
Abstract
No abstract record available.
Inventors
- 👤 Smith Cyril Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:40
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/1906; G05D23/1913; Y; Y10; Y10S; Y10S236/00; Y10S236/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1943-10-29 | 1944-04-29 | 1944-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-29 | 1948-04-29 | 1948-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-29 | 1952-04-29 | 1952-10-29 | $7700.00 | Window Closed / Lapsed |