US3053509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Massive reinforced concrete floor and ceiling structures
Assignee: Individual
•
Filing: 1956-05-22
•
Granted: 1962-09-11
•
Expires: 1976-05-22
Abstract
No abstract record available.
Inventors
- 👤 Haupt Max
- 👤 Bartels Hugo Constantin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:23
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/12; F24D3/14; E; E04; E04B; E04B5/00; E04B5/16; E04B5/32; E04B5/36; E04B5/48; E04B9/00; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1810926A
Cited
US2000539A
Cited
GB540678A
Cited
US2306385A
Cited
US2621027A
Cited
US2598279A
Cited
US2637530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |