US1687983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot-air furnace
Assignee: Cribben & Sexton Co
•
Filing: 1927-06-09
•
Granted: 1928-10-16
•
Expires: 1947-06-09
Abstract
No abstract record available.
Inventors
- 👤 Albert L Klees
- 👤 Greenfield Benjamin
- 👤 George B Ackermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:30
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24D; F24D5/00; F24H15/00; F24H15/30; F24H15/305; F24H15/31; F24H15/355; F24H15/36; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087; Y; Y10; Y10S; Y10S261/00; Y10S261/34
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) | 1931-10-16 | 1932-04-16 | 1932-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-10-16 | 1936-04-16 | 1936-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-10-16 | 1940-04-16 | 1940-10-16 | $7700.00 | Window Closed / Lapsed |