US3421280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building construction
Assignee: HRISTO V PAPAYOTI
•
Filing: 1966-06-24
•
Granted: 1969-01-14
•
Expires: 1986-06-24
Abstract
No abstract record available.
Inventors
- 👤 Charles W Attwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/18; E04B1/19; E04B1/1903; E04B2001/1918; E04B2001/1924; E04B2001/1936; E04B2001/1957; E04B2001/1963; E04B2001/1981; E04B2001/1984; E04B2001/199; E04B2001/1993
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US820586A
Cited
US2070244A
Cited
GB569377A
Cited
US2433677A
Cited
GB661126A
Cited
US2709975A
Cited
US3270478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |