US1863712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: Individual
•
Filing: 1930-07-14
•
Granted: 1932-06-21
•
Expires: 1950-07-14
Abstract
No abstract record available.
Inventors
- 👤 Albert H Byfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
F; F24; F24D; F24D1/00; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273; Y10T137/428; Y10T137/4301
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) | 1935-06-21 | 1935-12-21 | 1936-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-06-21 | 1939-12-21 | 1940-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-06-21 | 1943-12-21 | 1944-06-21 | $7700.00 | Window Closed / Lapsed |