US1539643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue expander
Assignee: Individual
•
Filing: 1923-09-22
•
Granted: 1925-05-26
•
Expires: 1943-09-22
Abstract
No abstract record available.
Inventors
- 👤 Bush Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
B; B21; B21D; B21D39/00; B21D39/08; B21D39/20; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53909; Y10T29/5393
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) | 1928-05-25 | 1928-11-24 | 1929-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-25 | 1932-11-24 | 1933-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-25 | 1936-11-24 | 1937-05-26 | $7700.00 | Window Closed / Lapsed |