US2621723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blind structure
Assignee: Individual
•
Filing: 1951-03-14
•
Granted: 1952-12-16
•
Expires: 1971-03-14
Abstract
No abstract record available.
Inventors
- 👤 Nicholas L Etten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:11
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/28; E06B9/30; E06B9/302; Y; Y10; Y10S; Y10S160/00; Y10S160/901
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US604329A
Cited
USRE22311E
Cited
US1302093A
Cited
US1893182A
Cited
US1999421A
Cited
US2467431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |