US3439459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction element
Assignee: Individual
•
Filing: 1966-11-28
•
Granted: 1969-04-22
•
Expires: 1986-11-28
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Johannes Silberkuhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:30
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/32; E04C2/326; E04B; E04B1/00; E04B1/32; E04B1/3205; E04B1/348; E04B1/34815; E04B1/3483; E04B7/00; E04B7/08; E04B7/10; E04B7/107; E04B2001/3235; E04B2001/3252; E04B2001/327; E04B2001/3288; E04B2001/3294
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AU221254A
Cited
US3137922A
Cited
US3143194A
Cited
US3186524A
Cited
US3239982A
Cited
US3357146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |