US2632380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sandwich grid
Assignee: Knapp Monarch Co
•
Filing: 1951-03-10
•
Granted: 1953-03-24
•
Expires: 1971-03-10
Abstract
No abstract record available.
Inventors
- 👤 Andrew S Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:14
CPC Classifications
A; A47; A47J; A47J37/00; A47J37/06; A47J37/0611
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1493444A
Cited
GB224904A
Cited
US1839112A
Cited
US1804196A
Cited
US1900619A
Cited
US2018698A
Cited
US2476213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |