US3538668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced architectural shapes
Assignee: HOWARD A ANDERSON
•
Filing: 1967-12-01
•
Granted: 1970-11-10
•
Expires: 1987-12-01
Abstract
No abstract record available.
Inventors
- 👤 Howard A Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/34; E04C2/36; E04C3/00; E04C3/02; E04C3/29; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24174
Claims Analysis
Total Claims: 0
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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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |