US2013113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system
Assignee: HOFFMAN SPECIALTY Co
•
Filing: 1932-07-22
•
Granted: 1935-09-03
•
Expires: 1952-07-22
Abstract
No abstract record available.
Inventors
- 👤 William K Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:07
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/0002; F24D19/0073; F24D1/00
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) | 1938-09-02 | 1939-03-04 | 1939-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-09-02 | 1943-03-04 | 1943-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-09-02 | 1947-03-04 | 1947-09-03 | $7700.00 | Window Closed / Lapsed |