US2928898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone-answering and message-recording system
Assignee: EMMETT R SALZBERG
•
Filing: 1953-11-30
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Granted: 1960-03-15
•
Expires: 1973-11-30
Abstract
No abstract record available.
Inventors
- 👤 Emmett R Salzberg
- 👤 David M Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:26
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/6515
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1955497A
Cited
US2540299A
Cited
US2537407A
Cited
US2673241A
Cited
US2673242A
Cited
US2665337A
Cited
US2709202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |