US1861484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concealed heater
Assignee: NAT TRUST Co Ltd
•
Filing: 1931-05-25
•
Granted: 1932-06-07
•
Expires: 1951-05-25
Abstract
No abstract record available.
Inventors
- 👤 John L Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/053; F28D1/0535; F28D21/00; F28D2021/0019; F28D2021/0035; Y; Y10; Y10S; Y10S165/00; Y10S165/327; Y10S165/337; Y10S165/34; Y10S165/903
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) | 1935-06-07 | 1935-12-07 | 1936-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-06-07 | 1939-12-07 | 1940-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-06-07 | 1943-12-07 | 1944-06-07 | $7700.00 | Window Closed / Lapsed |