US2054481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas furnace controlling mechanism
Assignee: Pittsburgh Equitable Meter Co
•
Filing: 1930-08-05
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Granted: 1936-09-15
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Expires: 1950-08-05
Abstract
No abstract record available.
Inventors
- 👤 Allen D Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:26
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/46; F23D14/60; Y; Y10; Y10T; Y10T137/00; Y10T137/1407; Y10T137/1842; Y10T137/1939; Y10T137/1963; Y10T137/1987; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7795; Y10T137/7809; Y10T137/782; Y10T137/7821; Y10T137/8593; Y10T137/87917
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) | 1939-09-15 | 1940-03-16 | 1940-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-09-15 | 1944-03-16 | 1944-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-09-15 | 1948-03-16 | 1948-09-15 | $7700.00 | Window Closed / Lapsed |