US1778980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone response device
Assignee: MCKELDIN
•
Filing: 1929-08-26
•
Granted: 1930-10-21
•
Expires: 1949-08-26
Abstract
No abstract record available.
Inventors
- 👤 James R Mckeldin
- 👤 Francis W Maxstadt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:37
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/654
Claims Analysis
Total Claims: 0
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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) | 1933-10-20 | 1934-04-21 | 1934-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-20 | 1938-04-21 | 1938-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-20 | 1942-04-21 | 1942-10-21 | $7700.00 | Window Closed / Lapsed |