US2691291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building of precast concrete segments
Assignee: Individual
•
Filing: 1949-08-02
•
Granted: 1954-10-12
•
Expires: 1969-08-02
Abstract
No abstract record available.
Inventors
- 👤 Henderson Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:06
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/348; E04B1/34815; E04B1/34823
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR743760A
Cited
US1411005A
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GB144913A
Cited
US1392402A
Cited
US1697070A
Cited
FR754815A
Cited
GB536572A
Cited
GB588623A
Cited
FR919044A
Cited
GB397695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |