US3531904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced construction for wood stress members
Assignee: Individual
•
Filing: 1968-06-17
•
Granted: 1970-10-06
•
Expires: 1988-06-17
Abstract
No abstract record available.
Inventors
- 👤 Arthur Carol Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:59
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/12; E04C3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335609A
Cited
GB391257A
Cited
US2039398A
Cited
US2738832A
Cited
US3067544A
Cited
US3344225A
Cited
US3416283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |