Patent US3394522A successfully refreshed from Google Patents.
US3394522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Connecting apparatus for prefabricated structural elements
Assignee: Individual
•
Filing: 1967-02-15
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Granted: 1968-07-30
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Expires: 1987-02-15
Abstract
No abstract record available.
Inventors
- 👤 Maurer Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:51
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/02; E04B1/04; E04B1/043; E04B1/046; E04B1/38; E04B1/61; E04B1/6108; E04B1/612; E04B1/6145; E04B1/6158; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL21447C
Cited
US1714024A
Cited
US2373409A
Cited
US2462415A
Cited
US2442184A
Cited
US2810287A
Cited
DE1200506B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |