US2581433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Window shade
Assignee: Individual
•
Filing: 1945-09-29
•
Granted: 1952-01-08
•
Expires: 1965-09-29
Abstract
No abstract record available.
Inventors
- 👤 North John
- 👤 North Esther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
A; A47; A47H; A47H23/00; A47H23/02; A47H23/04; A47H23/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US970456A
Cited
US1492556A
Cited
US1797321A
Cited
US1713452A
Cited
US1764789A
Cited
US2029675A
Cited
US2280358A
Cited
US2336692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |