Patent US748571A successfully refreshed from Google Patents.
Patent US2636972A successfully refreshed from Google Patents.
US2636972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheets-sheet
Assignee: —
•
Filing: —
•
Granted: 1953-04-28
•
Expires: 1970-04-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:40
CPC Classifications
D; D06; D06F; D06F75/00; D06F75/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306525A
Cited
US2277395A
Cited
US1438830A
Cited
FR579341A
Cited
US1751859A
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US1751850A
Cited
FR747195A
Cited
US2237323A
Cited
US2301129A
Cited
US2235362A
Cited
US2345413A
Cited
US2292337A
Cited
US2480337A
Cited
US2430194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |