US3217456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural member with multi-layered gypsum board fire protection
Assignee: United States Gypsum Co
•
Filing: 1962-10-12
•
Granted: 1965-11-16
•
Expires: 1982-10-12
Abstract
No abstract record available.
Inventors
- 👤 Paul S Quigg
- 👤 Nelsson Nels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:36
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94; E04B1/941; E04B1/943; E04B1/944
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US646503A
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US2047982A
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US2063010A
Cited
US2267929A
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US2797573A
Cited
US2851741A
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US2969616A
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US3056234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |