US2981171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer process and apparatus
Assignee: Bruning Charles Co Inc
•
Filing: 1958-03-06
•
Granted: 1961-04-25
•
Expires: 1978-03-06
Abstract
No abstract record available.
Inventors
- 👤 Hruby Joseph
- 👤 Sr Paul B Streich
- 👤 John L Tregay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:41
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/06; G03D5/067
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US248731A
Cited
CH137488A
Cited
US1867594A
Cited
US2241104A
Cited
US2562457A
Cited
US2605684A
Cited
DE853262C
Cited
GB758928A
Cited
FR1110571A
Cited
GB744243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |