Patent US-1916-1290643
Jump to navigation
Jump to search
"This device is ... for use in hospitals, offices and screen and storm doors where it is desired to [reduce] the noise which is caused by the slamming of the door." It's meant to be simple and robust and reliable. No aero application is mentioned in the patent spec.
- Tech class CPC B64C25/60: Oleo legs; CPC F16F9/103: Devices with one or more members moving linearly to and fro in chambers, any throttling effect being immaterial, i.e. damping by viscous shear effect only
- Inventor location: "a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented a new and useful Improvement in Pneumatic Door-Checks"
- Witnesses as shown on the final text page: H. J. Mailard and H. V. Nurmi, the latter, full name Henry V. Nurmi, of Virginia, MN, also being the assignee of 1/3 of the patent rights
Sources
- Patent 1290643 document and bibliographic info on espacenet
- Patent 1290643 at google patents
| Year filed | 1916 |
|---|---|
| Year granted | 1919 |
| Office | US |
| Patent number | 1290643 |
| Inventors | Hjalmer A. Nelson |
| Inventor country | US |
| Inventor location | St. Paul, MN, Ramsey county, MN, Minnesota |
| Applicant person | Hjalmer A. Nelson, Henry V. Nurmi |
| Applicant firm | |
| Applicant type | INDIV |
| Applicant is inventor? | 1 |
| Original title | Pneumatic door-check |
| English title | Pneumatic door-check |
| Tech fields | |
| Filing date | 1916-12-15 |
| Full specification filed date | |
| Application number | 13709916 |
| Grant date | 1919-01-07 |
| Granted? | 1 |
| Publication date | |
| Supplementary to patent | |
| Related to aircraft? | 0 |
| Serial number | 137099 |
| Patent agent | Howard Fischer |
| Assigned to | Henry V. Nurmi |
| National tech categories | |
| IPCs | |
| CPCs | CPC B64C25/60, CPC F16F9/103 |
| Family year | 1916 |
| First filing? | 1 |
| Cites these patents | |
| Citations from after 1930 | |
| Application ID | 47976937 |
| INPADOC family ID | 43239357 |
| Number of text pages | 2 |
| Number of diagram pages | 1 |
| Number of figures | 5 |
| Number of claims | 2 |
