US3516213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fireproofing of steel columns
Assignee: National Gypsum Co
•
Filing: 1968-02-28
•
Granted: 1970-06-23
•
Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Gale E Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:34
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)
US1796048A
Cited
US738950A
Cited
US2017911A
Cited
US2023452A
Cited
GB470651A
Cited
GB506191A
Cited
US2664740A
Cited
GB829504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |