Patent US2717060A successfully refreshed from Google Patents.
US2717060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arched building structures and elements for same
Assignee: National Steel Corp
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Filing: 1951-04-06
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Granted: 1955-09-06
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Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Collins Tappan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/32; E04B1/3205; E04C; E04C3/00; E04C3/38; E04C3/40; E04B2001/3235; E04B2001/3241; E04B2001/3252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB377235A
Cited
US1999500A
Cited
US2118191A
Cited
US2185916A
Cited
US2328197A
Cited
US2549816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-05 | 1959-03-07 | 1959-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-05 | 1963-03-07 | 1963-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-05 | 1967-03-07 | 1967-09-06 | $7700.00 | Window Closed / Lapsed |