US2990921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspended ceiling grid construction
Assignee: Individual
•
Filing: 1957-06-18
•
Granted: 1961-07-04
•
Expires: 1977-06-18
Abstract
No abstract record available.
Inventors
- 👤 William V Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:05
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/06; E04B9/12; E04B9/127; Y; Y10; Y10T; Y10T403/00; Y10T403/34; Y10T403/349; Y10T403/71; Y10T403/7176
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA527121A
Cited
US1412163A
Cited
US2189159A
Cited
US2141009A
Cited
US2658241A
Cited
US2683927A
Cited
US2830683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |