Patent US2228221A successfully refreshed from Google Patents.
Patent US100705A successfully refreshed from Google Patents.
US100705A
Expired / Lapsed
US
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Improvement in the construction of chimneys and flttes
Assignee: —
•
Filing: —
•
Granted: 1870-03-08
•
Expires: 1887-03-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:23
CPC Classifications
E; E04; E04D; E04D13/00; E04D13/14; E04D13/1407; Y; Y10; Y10S; Y10S425/00; Y10S425/126
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) | 1873-03-07 | 1873-09-06 | 1874-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1877-03-07 | 1877-09-06 | 1878-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1881-03-07 | 1881-09-06 | 1882-03-08 | $7700.00 | Window Closed / Lapsed |