US2831441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof structure for buildings
Assignee: Individual
•
Filing: 1955-06-06
•
Granted: 1958-04-22
•
Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Wayne E Phelps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:52
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE511309A
Cited
US1483037A
Cited
US1704275A
Cited
US1737049A
Cited
FR748501A
Cited
GB548928A
Cited
US2534852A
Cited
GB683972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |