US1681280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isothermal air compressor
Assignee: Doherty Research Co
•
Filing: 1926-09-11
•
Granted: 1928-08-21
•
Expires: 1946-09-11
Abstract
No abstract record available.
Inventors
- 👤 Bruckner Robert Earll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:57
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/0005; F04B39/0011; F04B39/06; F04B39/12
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) | 1931-08-21 | 1932-02-20 | 1932-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-08-21 | 1936-02-20 | 1936-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-08-21 | 1940-02-20 | 1940-08-21 | $7700.00 | Window Closed / Lapsed |