Patent US2621910A successfully refreshed from Google Patents.
Patent US3423896A successfully refreshed from Google Patents.
US3423896A
Expired / Lapsed
US
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Fire- and pressure-proof assembly of building elements
Assignee: Svenska Flaktfabriken AB
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Filing: 1966-11-25
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Granted: 1969-01-28
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Expires: 1986-11-25
Abstract
No abstract record available.
Inventors
- 👤 Lennart Widerby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:29
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/56; E04B2/58; E04B2/60; E04B2/62; E04B1/00; E04B1/38; E04B1/61; E04B1/6108; E04B1/612; E04B1/6166; E04B1/617; E04B1/62; E04B1/92; E04B1/94; E04B1/945; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04C2/292; F; F16; F16B; F16B5/00; F16B5/0004; F16B5/0056; F16B5/0068; F16B5/0072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |