US2172944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating system
Assignee: Burgess Battery Co
•
Filing: 1936-08-14
•
Granted: 1939-09-12
•
Expires: 1956-08-14
Abstract
No abstract record available.
Inventors
- 👤 Norris Ralph Forbush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:08
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/009; B60; B60H; B60H1/00; B60H1/00507; B60H1/00557; B60H1/00564; B60H1/24; B60H1/241; B60H1/245; B60H1/34; B60H1/3407; B60H2001/006; Y; Y10; Y10S; Y10S55/00; Y10S55/29
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) | 1942-09-11 | 1943-03-13 | 1943-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-11 | 1947-03-13 | 1947-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-11 | 1951-03-13 | 1951-09-12 | $7700.00 | Window Closed / Lapsed |