US2652116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforating system
Assignee: AT&T Inc
•
Filing: 1948-03-09
•
Granted: 1953-09-15
•
Expires: 1968-03-09
Abstract
No abstract record available.
Inventors
- 👤 Rudolph F Mallina
- 👤 John M Melick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/246; G; G06; G06K; G06K17/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1298440A
Cited
US1490092A
Cited
GB201221A
Cited
GB252734A
Cited
US1792283A
Cited
US1851838A
Cited
US1870230A
Cited
US2028264A
Cited
US2112951A
Cited
US2074189A
Cited
US2323833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |