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US913853A
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US
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Pneumatic operating mechanism for doors or other devices.
Assignee: BURDETT-ROWNTREE MANUFACTURING Co
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Filing: 1908-04-09
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Granted: 1909-03-02
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Expires: 1928-04-09
Abstract
No abstract record available.
Inventors
- 👤 Harold Rowntree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:09
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B1/024; Y; Y10; Y10S; Y10S91/00; Y10S91/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1912-03-01 | 1912-08-31 | 1913-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1916-03-01 | 1916-08-31 | 1917-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1920-03-01 | 1920-08-31 | 1921-03-02 | $7700.00 | Window Closed / Lapsed |