Patent US2725003A successfully refreshed from Google Patents.
US2725003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet metal closures for hatchways
Assignee: Individual
•
Filing: 1950-06-19
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Granted: 1955-11-29
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Expires: 1970-06-19
Abstract
No abstract record available.
Inventors
- 👤 Robert J Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:15
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US971313A
Cited
US1235446A
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US1649607A
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US1828797A
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US2213010A
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US2204852A
Cited
US2174989A
Cited
US2324138A
Cited
GB538979A
Cited
US2342619A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |