Patent US2638980A successfully refreshed from Google Patents.
US2638980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Program control apparatus
Assignee: Individual
•
Filing: 1952-06-18
•
Granted: 1953-05-19
•
Expires: 1972-06-18
Abstract
No abstract record available.
Inventors
- 👤 William B Dolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:12
CPC Classifications
H; H04; H04R; H04R27/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US946380A
Cited
US1443451A
Cited
US1480403A
Cited
US1897533A
Cited
US2398677A
Cited
US2530754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |