US2931468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-diffusing structural panels
Assignee: Individual
•
Filing: 1955-02-04
•
Granted: 1960-04-05
•
Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
- 👤 Robert R Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:31
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/54; E04C2/543; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/161; Y10T428/162; Y10T428/23; Y10T428/237; Y10T428/24; Y10T428/24174
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1312908A
Cited
US1344882A
Cited
US2053135A
Cited
US2311613A
Cited
US2302586A
Cited
US2304718A
Cited
US2537216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |