The following is a list of “Old Act” patents that issued with the largest time span between the filing date and the issue date. Unissued “Old Act” patents are not published so there may be others which are still pending. Also my data is not completely, so this list is only based on recently issued “Old Act” patents. If you notice any omissions or errors, please let me know.
[List generated April 13, 2023]
| Patent Number | Title | Filing Date | Issue Date | Duration (years) | |
|---|---|---|---|---|---|
| 1 | 1341644 | RECOMBINANT DNA MOLECULES AND THEIR METHOD OF PRODUCTION | 1979-12-21 | 2023-03-07 | 43.24 |
| 2 | 1341643 | NON-PASSAGEABLE VIRUSES | 1980-05-22 | 2023-02-28 | 42.80 |
| 3 | 1341558 | RADAR JAMMING METHOD AND APPARATU | 1965-09-22 | 2007-10-23 | 42.11 |
| 4 | 1341641 | EXPRESSION OF RECOMBINANT HBV SURFACE ANTIGEN | 1981-04-22 | 2023-01-17 | 41.77 |
| 5 | 1341642 | SYNTHESIS OF HEPATITIS B VIRUS SURFACE ANTIGEN BY YEAST | 1982-08-03 | 2023-02-21 | 40.58 |
| 6 | 1341487 | INFRARED DECEPTION COUNTERMEASURES SYSTE | 1967-12-08 | 2005-08-16 | 37.72 |
| 7 | 1341519 | PROSTHETIC VASCULAR GRAF | 1975-01-16 | 2007-01-02 | 31.98 |
| 8 | 1341533 | MULTIPLE SPECTRAL BAND OPTO-MECHANICAL MODULATO | 1975-09-10 | 2007-07-03 | 31.83 |
| 9 | 1341475 | OPTICAL DETECTION SYSTEM | 1973-06-06 | 2005-03-15 | 31.79 |
| 10 | 1336083 | CONTROL SYSTEMS FOR MOVING BODIE | 1964-06-04 | 1995-06-27 | 31.08 |
| 11 | 1341218 | RADIATION SUPPRESSION | 1971-01-22 | 2001-05-01 | 30.29 |
| 12 | 1336292 | CONTROL SYSTEMS FOR MISSILES AND OTHER MOVING BODIE | 1965-12-06 | 1995-07-11 | 29.61 |
| 13 | 1336084 | MISSILE CONTROL SYSTE | 1965-12-06 | 1995-06-27 | 29.58 |
| 14 | 1336085 | MISSILE CONTROL MECHANIS | 1965-12-06 | 1995-06-27 | 29.58 |
| 15 | 1336086 | CONTROL SYSTEMS FOR MOVING BODIE | 1966-03-04 | 1995-06-27 | 29.33 |
| 16 | 1341633 | INTERLEUKIN-2 POLYPEPTIDES | 1983-12-15 | 2013-01-29 | 29.15 |
| 17 | 1341604 | DNA SEQUENCES, RECOMBINANT DNA MOLECULES AND PROCESSES FOR PRODUCING HUMAN FIBROBLAST INTERFERON-LIKE POLYPEPTIDE | 1981-04-01 | 2010-05-04 | 29.11 |
| 18 | 1332460 | SONAR TRANSDUCE | 1965-09-28 | 1994-10-11 | 29.05 |
| 19 | 1341638 | FIBROBLAST GROWTH FACTOR | 1986-06-09 | 2014-06-17 | 28.04 |
| 20 | 1341640 | RECOMBINANT FIBROBLAST GROWTH FACTORS | 1986-09-12 | 2014-09-16 | 28.03 |
| 21 | 1341583 | INTERFERONS AND PROCESS FOR THEIR PREPARATIO | 1981-06-30 | 2008-11-18 | 27.41 |
| 22 | 1341567 | DNA SEQUENCES, RECOMBINANT DNA MOLECULES AND PROCESSES FOR PRODUCING HUMAN INTERFERON – LIKE POLYPEPTIDE | 1981-01-07 | 2008-02-19 | 27.13 |
| 23 | 1341563 | DNA CODING FOR HUMAN FIBROBLAST INTERFERON POLYPEPTIDE AND RECOMBINANT PLASMI | 1980-10-30 | 2007-12-04 | 27.11 |
| 24 | 1341622 | INSECT RESISTANT PLANTS | 1984-09-24 | 2011-10-04 | 27.04 |
| 25 | 1341569 | MICROBIAL PRODUCTION OF HUMAN FIBROBLAST INTERFERON | 1981-09-24 | 2008-03-25 | 26.52 |