Patent US5319487A successfully refreshed from Google Patents.
US2260221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duct joint construction
Assignee: GRAY METAL PRODUCTS Inc
•
Filing: 1940-05-25
•
Granted: 1941-10-21
•
Expires: 1960-05-25
Abstract
No abstract record available.
Inventors
- 👤 William H Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:25
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0209; F16; F16L; F16L23/00; F16L23/12; F16L23/14; F16L25/00; F16L25/0009; Y; Y10; Y10S; Y10S138/00; Y10S138/04; Y10S285/00; Y10S285/921
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) | 1944-10-20 | 1945-04-21 | 1945-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-20 | 1949-04-21 | 1949-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-20 | 1953-04-21 | 1953-10-21 | $7700.00 | Window Closed / Lapsed |