Patent US2630799A successfully refreshed from Google Patents.
US2630799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable head-end collar for respirators
Assignee: WARREN E COLLINS Inc
•
Filing: 1951-12-29
•
Granted: 1953-03-10
•
Expires: 1971-12-29
Abstract
No abstract record available.
Inventors
- 👤 Earl C Nickles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:08
CPC Classifications
A; A61; A61H; A61H31/00; A61H31/02; Y; Y10; Y10S; Y10S160/00; Y10S160/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |