US2802214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear-enveloping cups
Assignee: Boeing Co
•
Filing: 1954-07-15
•
Granted: 1957-08-13
•
Expires: 1974-07-15
Abstract
No abstract record available.
Inventors
- 👤 Thrift G Hanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:37
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/16; A42B3/166
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1066511A
Cited
US1606878A
Cited
US1761302A
Cited
US2132864A
Cited
US2297874A
Cited
US2324735A
Cited
US2468721A
Cited
US2570675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |