| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Consumer goods | |
| #3 | Packaging and shipping | |
| #4 | Measurement | |
| #5 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Office accessories | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Transport or storage devices | |
| #5 | Labelling machines | |
| #6 | Cutting | |
| #7 | Measuring volume |
| # | Name | Total Patents |
|---|---|---|
| #1 | Keiser Arthur J | 7 |
| #2 | Lawrence Leon W | 2 |
| #3 | Bircher Eugene A | 1 |
| #4 | Keiser Esther E | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2272323A | Envelope opening machine | |
| US2220251A | Envelope opening machine | |
| US2027045A | Envelope opening machine | |
| US1838841A | Stamp affixing machine | |
| US1799820A | Envelope-sealing machine | |
| US1667120A | Feeding or displacing belt | |
| US1703738A | Envelope-opening machine | |
| US1518330A | Envelope-sealing machine | |
| US1528022A | Liquid-dispensing apparatus | |
| US1426745A | Envelope-sealing machine | |
| US1273318A | Machine for opening envelops. |