US2821892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic printing apparatus for seismic and other records
Assignee: Shell Development Co
•
Filing: 1952-09-30
•
Granted: 1958-02-04
•
Expires: 1972-09-30
Abstract
No abstract record available.
Inventors
- 👤 Merten Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:11
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1176384A
Cited
US1007760A
Cited
US1844162A
Cited
US1906973A
Cited
GB417645A
Cited
US2018200A
Cited
GB430995A
Cited
FR775516A
Cited
US2147532A
Cited
US2276423A
Cited
US2440971A
Cited
US2604955A
Cited
US2617337A
Cited
US2710070A
Cited
US2710661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |