US3435580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated,reinforced concrete,panel-type building unit
Assignee: OTTO BUEHNER AND CO
•
Filing: 1966-03-17
•
Granted: 1969-04-01
•
Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Taylor S Merrill
- 👤 Donald D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:05
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/284; E04B; E04B2/00; E04B2/56; E04B2/58; E04B2/88; E04B2/90; E04B2/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1796048A
Cited
CA674328A
Cited
US1661183A
Cited
US1915896A
Cited
US1959083A
Cited
US2151148A
Cited
US2961804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-31 | 1972-09-30 | 1973-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-31 | 1976-09-30 | 1977-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-31 | 1980-09-30 | 1981-04-01 | $7700.00 | Window Closed / Lapsed |