Patent US3493912A successfully refreshed from Google Patents.
US2975403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmission system
Assignee: Individual
•
Filing: 1956-07-13
•
Granted: 1961-03-14
•
Expires: 1976-07-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles Henry Doersam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:58
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/282
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1915993A
Cited
US2131911A
Cited
US2203995A
Cited
US2425329A
Cited
US2410669A
Cited
US2666911A
Cited
US2680241A
Cited
US2533242A
Cited
US2748341A
Cited
US2776418A
Cited
US2784397A
Cited
US2785388A
Cited
US2776421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |