Patent US3452372A successfully refreshed from Google Patents.
US3452372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backrest
Assignee: Individual
•
Filing: 1967-04-07
•
Granted: 1969-07-01
•
Expires: 1987-04-07
Abstract
No abstract record available.
Inventors
- 👤 William M Emery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:54
CPC Classifications
A; A47; A47C; A47C20/00; A47C20/02; A47C20/027; A47C1/00; A47C1/14; A47C1/146; A47C7/00; A47C7/36; A47C7/40; A47C7/402; Y; Y10; Y10S; Y10S5/00; Y10S5/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US947383A
Cited
US1151894A
Cited
US2834032A
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US2940088A
Cited
US3087170A
Cited
US3101972A
Cited
US3284817A
Cited
US3378861A
Cited
US3353196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |