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US2725220A
Expired / Lapsed
US
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Self-sealing door
Assignee: ACTNA STANDARD ENGINEERING COM
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Filing: 1953-04-15
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Granted: 1955-11-29
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Expires: 1973-04-15
Abstract
No abstract record available.
Inventors
- 👤 Hale Andrew
- 👤 Robert K Perkins
- 👤 Wallace H Woodrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:37
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/02; B29B7/22; B29B7/26; B29B7/263; B29B7/266; C; C25; C25D; C25D3/00; C25D3/02; C25D3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2299502A
Cited
US2615689A
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 |