US2620521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flush door
Assignee: Individual
•
Filing: 1950-07-19
•
Granted: 1952-12-09
•
Expires: 1970-07-19
Abstract
No abstract record available.
Inventors
- 👤 Fleet Stephen Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:29
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/70; E06B3/82; E06B3/822; E06B3/825; E06B3/96; E06B3/984; E06B3/7015; E06B2003/7025; E06B2003/7094
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2288104A
Cited
US937430A
Cited
US2173808A
Cited
US2128540A
Cited
US2178729A
Cited
US2214675A
Cited
US2243022A
Cited
DK53675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |