Patent US2603818A successfully refreshed from Google Patents.
US2603818A
Expired / Lapsed
US
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Door check mechanism
Assignee: Individual
•
Filing: 1948-04-12
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Granted: 1952-07-22
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Expires: 1968-04-12
Abstract
No abstract record available.
Inventors
- 👤 Carlson Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:42
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/04; E05F3/10; E05F3/106; E05D; E05D7/00; E05D7/08; E05D7/081; E05F3/104; E05F3/108; E05F3/22; E05F3/225; E05F3/226; E05Y; E05Y2600/00; E05Y2600/40; E05Y2600/41; E05Y2600/452; E05Y2800/00; E05Y2800/10; E05Y2800/12; E05Y2800/20; E05Y2800/21; E05Y2800/26; E05Y2800/28; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |