Patent US3638991A successfully refreshed from Google Patents.
US2608752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making single leaf springs
Assignee: Motors Liquidation Co
•
Filing: 1947-11-13
•
Granted: 1952-09-02
•
Expires: 1967-11-13
Abstract
No abstract record available.
Inventors
- 👤 Schilling Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/02; C21D7/04; C21D7/06; B; B21; B21D; B21D53/00; B21D53/88; B21D53/886; Y; Y10; Y10S; Y10S29/00; Y10S29/032; Y10S29/036; Y10T; Y10T29/00; Y10T29/49; Y10T29/49609; Y10T29/49611
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US318863A
Cited
US937180A
Cited
US1101586A
Cited
US1859104A
Cited
US2155073A
Cited
US2234850A
Cited
US2211647A
Cited
US2249678A
Cited
US2252823A
Cited
US2422431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |