Patent US2440920A successfully refreshed from Google Patents.
US2440920A
Expired / Lapsed
US
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Building apparatus
Assignee: Individual
•
Filing: 1941-08-15
•
Granted: 1948-05-04
•
Expires: 1961-08-15
Abstract
No abstract record available.
Inventors
- 👤 Stepanian Stephen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:53
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/02; Y; Y10; Y10S; Y10S425/00; Y10S425/126
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |