Patent US5192301A successfully refreshed from Google Patents.
US1921432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant temperature apparatus
Assignee: AT&T Inc
•
Filing: 1930-05-05
•
Granted: 1933-08-08
•
Expires: 1950-05-05
Abstract
No abstract record available.
Inventors
- 👤 Stallard Burrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02; H03L1/04
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) | 1936-08-07 | 1937-02-06 | 1937-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-07 | 1941-02-06 | 1941-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-07 | 1945-02-06 | 1945-08-08 | $7700.00 | Window Closed / Lapsed |