US2877878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension ceiling
Assignee: National Gypsum Co
•
Filing: 1953-06-25
•
Granted: 1959-03-17
•
Expires: 1973-06-25
Abstract
No abstract record available.
Inventors
- 👤 Albert F Jantsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:28
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/06; E04B9/12; E04B9/16; E04B9/22; E04B9/24; E04B9/247
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2447694A
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US2481794A
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US2499278A
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US2485090A
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US2667667A
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US2641035A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |